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wacky

[wak-ee] /ˈwæk i/
adjective, wackier, wackiest. Slang.
1.
odd or irrational; crazy:
They had some wacky plan for selling more books.
Also, whacky.
Origin
1935-1940
1935-40; apparently whack (noun, as in out of whack) + -y1
Related forms
wackily, adverb
wackiness, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for wackily

wacky

/ˈwækɪ/
adjective wackier, wackiest
1.
(slang) eccentric, erratic, or unpredictable
Derived Forms
wackily, adverb
wackiness, noun
Word Origin
C19 (in dialect sense: a fool, an eccentric): from whack (hence, a whacky, a person who behaves as if he had been whacked on the head)
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 wackily

wacky

adj.

"crazy, eccentric," 1935, variant of whacky (n.) "fool," late 1800s British slang, probably ultimately from whack "a blow, stroke," from the notion of being whacked on the head one too many times.

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

wacky

adjective

(also wacked-out or wacko or whacked or whacked-out) Crazy; eccentric; nutty: You think I'm going wacky?/ annually collects whacky accidents/ the most wacked-out cop game anybody had ever seen any cops play/ the wacked-out hustler who talks Winkler into running a call-girl service out of the morgue/ She tried to convert me to her religion! She was whacked

[1935+; fr British dialect whacky, ''fool,'' attested fr the early 1900s; whacky, ''a person who fools around,'' is attested in British tailors' talk fr the late 1800s; perhaps fr being whacked over the head too often; perhaps influenced by whack off ''masturbate,'' and semantically akin to jerk]


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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