adjective, wackier, wackiest. Slang.
odd or irrational; crazy: They had some wacky plan for selling more books.
Also, whacky.

1935–40; apparently whack (noun, as in out of whack) + -y1

wackily, adverb
wackiness, noun
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World English Dictionary
wacky (ˈwækɪ)
adj , wackier, wackiest
slang eccentric, erratic, or unpredictable
[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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"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. Wack "crazy person" is a 1938 back-formation; extended form wacko is recorded from 1977. Wack in slang sense
of "worthless, stupid," is attested from late 1990s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
It was a wonderful, wacky, crazy-quilt dream as long as as it lasted.
Because of this media failure, wacky alternative theories about the cause of
  climate change are on the increase.
That's where you learn all those wacky ideas about evolution.
No conspiracy theories, no wacky illogical prejudices, nothing.
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