a thin, crisp biscuit.
Also called cracker bonbon. a small paper roll used as a party favor, that usually contains candy, trinkets, etc., and that pops when pulled sharply at one or both ends.
(initial capital letter) Sometimes Disparaging and Offensive. a native or inhabitant of Georgia (used as a nickname).
Slang: Disparaging and Offensive. a poor white person living in some rural parts of the southeastern U.S.
snapper ( def 5 ).
braggart; boaster.
a person or thing that cracks.
a chemical reactor used for cracking. Compare catalytic cracking, fractionator.
crackers, Informal. wild; crazy: They went crackers over the new styles.

1400–50; late Middle English craker. See crack, -er1; (defs 4–5) perhaps orig. in sense “braggart,” applied to frontiersmen of the southern American colonies in the 1760s, though subsequently given other interpretations (cf. corn-cracker); for crackers crazy, cf. cracked, -ers Unabridged


verb (used without object)
to break without complete separation of parts; become fissured: The plate cracked when I dropped it, but it was still usable.
to break with a sudden, sharp sound: The branch cracked under the weight of the snow.
to make a sudden, sharp sound in or as if in breaking; snap: The whip cracked.
(of the voice) to break abruptly and discordantly, especially into an upper register, as because of weariness or emotion.
to fail; give way: His confidence cracked under the strain.
to succumb or break down, especially under severe psychological pressure, torture, or the like: They questioned him steadily for 24 hours before he finally cracked.
Chemistry. to decompose as a result of being subjected to heat.
Chiefly South Midland and Southern U.S. to brag; boast.
Chiefly Scot. to chat; gossip.
verb (used with object)
to cause to make a sudden sharp sound: The driver cracked the whip.
to break without complete separation of parts; break into fissures.
to break with a sudden, sharp sound: to crack walnuts.
to strike and thereby make a sharp noise: The boxer cracked his opponent on the jaw.
to induce or cause to be stricken with sorrow or emotion; affect deeply.
to utter or tell: to crack jokes.
to cause to make a cracking sound: to crack one's knuckles.
to damage, weaken, etc.: The new evidence against him cracked his composure.
to make mentally unsound.
to make (the voice) harsh or unmanageable.
to solve; decipher: to crack a murder case.
Informal. to break into (a safe, vault, etc.).
Chemistry. to subject to the process of cracking, as in the distillation of petroleum.
Informal. to open and drink (a bottle of wine, liquor, beer, etc.).
a break without complete separation of parts; fissure.
a slight opening, as between boards in a floor or wall, or between a door and its doorpost.
a sudden, sharp noise, as of something breaking.
the snap of or as of a whip.
a resounding blow: He received a terrific crack on the head when the branch fell.
Informal. a witty or cutting remark; wisecrack.
a break or change in the flow or tone of the voice.
Informal. opportunity; chance; try: Give him first crack at the new job.
a flaw or defect.
Also called rock. Slang. pellet-size pieces of highly purified cocaine, prepared with other ingredients for smoking, and known to be especially potent and addicting.
Masonry. check1 ( def 41 ).
a mental defect or deficiency.
a shot, as with a rifle: At the first crack, the deer fell.
a moment; instant: He was on his feet again in a crack.
Slang. a burglary, especially an instance of housebreaking.
Chiefly British. a person or thing that excels in some respect.
Slang: Vulgar. the vulva.
Chiefly Scot. conversation; chat.
British Dialect. boasting; braggadocio.
Archaic. a burglar.
first-rate; excellent: a crack shot.
with a cracking sound.
Verb phrases
crack down, to take severe or stern measures, especially in enforcing obedience to laws or regulations: The police are starting to crack down on local drug dealers.
crack off, to cause (a piece of hot glass) to fall from a blowpipe or punty.
crack on, Nautical.
(of a sailing vessel) to sail in high winds under sails that would normally be furled.
(of a power vessel) to advance at full speed in heavy weather.
crack up, Informal.
to suffer a mental or emotional breakdown.
to crash, as in an automobile or airplane: He skidded into the telephone pole and cracked up.
to wreck an automobile, airplane, or other vehicle.
to laugh or to cause to laugh unrestrainedly: That story about the revolving door really cracked me up. Ed cracked up, too, when he heard it.
crack a book, Informal. to open a book in order to study or read: He hardly ever cracked a book.
crack a smile, Informal. to smile.
crack wise, Slang. to wisecrack: We tried to be serious, but he was always cracking wise.
fall through the cracks, to be overlooked, missed, or neglected: In any inspection process some defective materials will fall through the cracks. Also, slip between the cracks.
get cracking, Informal.
to begin moving or working; start: Let's get cracking on these dirty dishes!
to work or move more quickly.

before 1000; Middle English crak(k)en (v.), crak (noun), Old English cracian to resound; akin to German krachen, Dutch kraken (v.), and German Krach, Dutch krak (noun)

crackable, adjective
crackless, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To cracker
World English Dictionary
crack (kræk)
1.  to break or cause to break without complete separation of the parts: the vase was cracked but unbroken
2.  to break or cause to break with a sudden sharp sound; snap: to crack a nut
3.  to make or cause to make a sudden sharp sound: to crack a whip
4.  to cause (the voice) to change tone or become harsh or (of the voice) to change tone, esp to a higher register; break
5.  informal to fail or cause to fail
6.  to yield or cause to yield: to crack under torture
7.  (tr) to hit with a forceful or resounding blow
8.  (tr) to break into or force open: to crack a safe
9.  (tr) to solve or decipher (a code, problem, etc)
10.  informal (tr) to tell (a joke, etc)
11.  to break (a molecule) into smaller molecules or radicals by the action of heat, as in the distillation of petroleum
12.  (tr) to open (esp a bottle) for drinking: let's crack another bottle
13.  dialect (Scot), (Northern English) (intr) to chat; gossip
14.  informal (tr) to achieve (esp in the phrase crack it)
15.  informal (Austral) (tr) to find or catch: to crack a wave in surfing
16.  informal crack a smile to break into a smile
17.  informal (Austral), (NZ) crack hardy, crack hearty to disguise one's discomfort, etc; put on a bold front
18.  informal crack the whip to assert one's authority, esp to put people under pressure to work harder
19.  a sudden sharp noise
20.  a break or fracture without complete separation of the two parts: a crack in the window
21.  a narrow opening or fissure
22.  informal a resounding blow
23.  a physical or mental defect; flaw
24.  a moment or specific instant: the crack of day
25.  a broken or cracked tone of voice, as a boy's during puberty
26.  informal (often foll by at) an attempt; opportunity to try: he had a crack at the problem
27.  slang a gibe; wisecrack; joke
28.  slang a person that excels
29.  dialect (Scot), (Northern English) a talk; chat
30.  slang a processed form of cocaine hydrochloride used as a stimulant. It is highly addictive
31.  informal chiefly (Irish) Also: craic fun; informal entertainment: the crack was great in here last night
32.  obsolete, slang a burglar or burglary
33.  crack of dawn
 a.  the very instant that the sun rises
 b.  very early in the morning
34.  informal a fair crack of the whip a fair chance or opportunity
35.  crack of doom doomsday; the end of the world; the Day of Judgment
36.  slang (prenominal) first-class; excellent: a crack shot
[Old English cracian; related to Old High German krahhōn, Dutch kraken, Sanskrit gárjati he roars]

cracker (ˈkrækə)
1.  a decorated cardboard tube that emits a bang when pulled apart, releasing a toy, a joke, or a paper hat
2.  short for firecracker
3.  a thin crisp biscuit, usually unsweetened
4.  a person or thing that cracks
5.  (US) another word for poor White
6.  slang (Brit) a thing or person of notable qualities or abilities
7.  informal (Austral), (NZ) not worth a cracker worthless; useless

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  cracker
Part of Speech:  n
Definition:  See Christmas cracker's 21st Century Lexicon
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Word Origin & History

O.E. cracian "make a sharp noise," from P.Gmc. *krakojan, probably onomatopoeic. The noun meaning "split, opening," is 14c. Meaning "try, attempt" first attested 1836, probably a hunting metaphor, from slang sense of "fire a gun." Meaning "rock cocaine" is first attested 1985. Cracked "mentally unsound"
is 17c. (though the equivalent Gk. word was used in this sense by Aristophanes), while crack as in "top-notch, superior" is slang from 1793. Crackpot "pretentious, worthless person" dates from 1883. The superstition that it is bad luck to step on sidewalk cracks has been traced to c.1890.

mid-15c., "hard wafer," but the specific application to a thin, crisp biscuit is 1739. Cracker-barrel (adj.) "emblematic of down-home ways and views" is from 1877. Cracker, Southern U.S. derogatory term for "poor, white trash" (1766), is from mid-15c. crack "to boast" (e.g. not what it's cracked up to
be), originally a Scottish word. Especially of Georgians by 1808, though often extended to residents of northern Florida.
"I should explain to your Lordship what is meant by crackers; a name they have got from being great boasters; they are a lawless set of rascalls on the frontiers of Virginia, Maryland, the Carolinas and Georgia, who often change their places of abode." [1766, G. Cochrane]
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

cracker definition

An individual who attempts to gain unauthorised access to a computer system. These individuals are often malicious and have many means at their disposal for breaking into a system. The term was coined ca. 1985 by hackers in defence against journalistic misuse of "hacker". An earlier attempt to establish "worm" in this sense around 1981--82 on Usenet was largely a failure.
Use of both these neologisms reflects a strong revulsion against the theft and vandalism perpetrated by cracking rings. The neologism "cracker" in this sense may have been influenced not so much by the term "safe-cracker" as by the non-jargon term "cracker", which in Middle English meant an obnoxious person (e.g., "What cracker is this same that deafs our ears / With this abundance of superfluous breath?" -- Shakespeare's King John, Act II, Scene I) and in modern colloquial American English survives as a barely gentler synonym for "white trash".
While it is expected that any real hacker will have done some playful cracking and knows many of the basic techniques, anyone past larval stage is expected to have outgrown the desire to do so except for immediate practical reasons (for example, if it's necessary to get around some security in order to get some work done).
Contrary to widespread myth, cracking does not usually involve some mysterious leap of hackerly brilliance, but rather persistence and the dogged repetition of a handful of fairly well-known tricks that exploit common weaknesses in the security of target systems. Accordingly, most crackers are only mediocre hackers.
Thus, there is far less overlap between hackerdom and crackerdom than the mundane reader misled by sensationalistic journalism might expect. Crackers tend to gather in small, tight-knit, very secretive groups that have little overlap with the huge, open hacker poly-culture; though crackers often like to describe *themselves* as hackers, most true hackers consider them a separate and lower form of life, little better than virus writers. Ethical considerations aside, hackers figure that anyone who can't imagine a more interesting way to play with their computers than breaking into someone else's has to be pretty losing.
See also Computer Emergency Response Team, dark-side hacker, hacker ethic, phreaking, samurai, Trojan horse.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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