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[hwak, wak] /ʰwæk, wæk/
verb (used with object)
to strike with a smart, resounding blow or blows.
Slang. to divide into or take in shares (often followed by up):
Whack the loot between us two.
verb (used without object)
to strike a smart, resounding blow or blows.
a smart, resounding blow:
a whack with his hand.
Informal. a trial or attempt:
to take a whack at a job.
Slang. a portion or share.
Verb phrases
whack off,
  1. to cut off or separate with a blow:
    The cook whacked off the fish's head.
  2. Slang: Vulgar. to masturbate.
whack out, Slang. to produce quickly or, sometimes, carelessly:
She whacks out a short story every week or so.
out of whack, Informal. out of order or alignment; not in proper condition.
Origin of whack
1710-20; orig. dial., Scots form of thwack; cf. whang2, whittle
Related forms
whacker, noun
5. try, go, turn. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for whack
Contemporary Examples
Historical Examples
  • After a time we heard the whack of his implement; then after another long time we heard it whack again.

    The Forest Stewart Edward White
  • Virginie had caught her a whack with all her might on her bare arm, just above the elbow.

    L'Assommoir Emile Zola
  • Up flew the poker, and down it descended with a whack, upon—vacancy!

    The Gypsy Queen's Vow May Agnes Fleming
  • But on most of the occasions she only caught some whack for her trouble.

    L'Assommoir Emile Zola
  • You've 'ad your whack out of it, and now we wants to have hourn.

    Castle Richmond Anthony Trollope
British Dictionary definitions for whack


verb (transitive)
to strike with a sharp resounding blow
(usually passive) (Brit, informal) to exhaust completely
(transitive; usu foll by in or on) (informal) to put something on to or into something else with force or abandon: whack on some sunscreen
(transitive) (US, slang) to murder: if you were out of line you got whacked
a sharp resounding blow or the noise made by such a blow
(informal) a share or portion
(informal) a try or attempt (esp in the phrase have a whack at)
(informal) out of whack, out of order; unbalanced: the whole system is out of whack
an exclamation imitating the noise of a sharp resounding blow
Derived Forms
whacker, noun
Word Origin
C18: perhaps a variant of thwack, ultimately of imitative origin
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for whack

"to strike sharply," 1719, probably of imitative origin. The noun is from 1737. The word in out of whack (1885) is perhaps the slang meaning "share, just portion" (1785), which may be from the notion of the blow that divides, or the rap of the auctioneer's hammer.

Online Etymology Dictionary, © 2010 Douglas Harper
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Slang definitions & phrases for whack



To do the ''vogueing'' dance or performance: She vogued in the West Village. Disappeared in San Diego with a porn filmmaker/ commenced vogueing official International Body-Building Federation poses. Such brazen posing! (1980s+)



The human brain: Slip a microchip into snug contact with your gray matter (a.k.a. wetware)/ wetware: the human brain and its DNA code (1980s+ Computer)

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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whack in Technology

According to arch-hacker James Gosling, to "...modify a program with no idea whatsoever how it works." (See whacker.) It is actually possible to do this in nontrivial circumstances if the change is small and well-defined and you are very good at glarking things from context. As a trivial example, it is relatively easy to change all "stderr" writes to "stdout" writes in a piece of C filter code which remains otherwise mysterious.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Idioms and Phrases with whack


In addition to the idioms beginning with whack
The American Heritage® Idioms Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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