Definition of

Wacky

  1. (adj, all) ludicrous, foolish
    wore a goofy hat
    a silly idea
    some wacky plan for selling more books
  2. (adj, all) informal or slang terms for mentally irregular

via WordNet, Princeton University

Origin of the word Wacky

  1. "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 fro… more

via Online Etymology Dictionary, ©2001 Douglas Harper

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