Origin of wacky; from uncertain or unknown; perhaps whack + -y: compare slap-happy
adjectivewack·i·er, wack·i·est also whack·i·er or whack·i·est Slang
- Eccentric or irrational: a wacky person.
- Crazy; silly: a wacky outfit.
Origin of wackyVariant of whacky, probably from the phrase out of whack; see whack.
(comparative wackier, superlative wackiest)
- Of a person or their behaviour, zany.
(countable and uncountable, plural wackies)
- Alternative form of wacke.