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
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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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