Definition of wacky

< wacko

Waco >

wack·y    (wk) KEY  also whack·y  (hwk, wk) KEY 

ADJECTIVE:
Slang wack·i·er, wack·i·est

1. Eccentric or irrational: a wacky person.
2. Crazy; silly: a wacky outfit.

---

ETYMOLOGY:
Variant of whacky, probably from the phrase out of whack ; see whack

OTHER FORMS:
wacki·ly(Adverb), wacki·ness(Noun)