cracker

[krak-er]
noun
1.
a thin, crisp biscuit.
3.
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.
4.
(initial capital letter) Sometimes Disparaging and Offensive. a native or inhabitant of Georgia (used as a nickname).
5.
Slang: Disparaging and Offensive. a poor white person living in some rural parts of the southeastern U.S.
6.
snapper ( def 5 ).
7.
braggart; boaster.
8.
a person or thing that cracks.
9.
a chemical reactor used for cracking. Compare catalytic cracking, fractionator.
adjective
10.
crackers, Informal. wild; crazy: They went crackers over the new styles.

Origin:
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

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cracker (ˈkrækə)
 
n
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

crackers (ˈkrækəz)
 
adj
(Brit) (postpositive) a slang word for insane

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

cracker
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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Example sentences
The sad thing really is that people listen to these crackers.
They've been called rednecks, hillbillies and crackers.
There is no such thing as a six-way, although oyster crackers are the customary
  garnish.
Even couples whose heads are so white and puffy they should wear hats made out
  of graham crackers and chocolate.
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