ONAD→wacko

wacko

EnglishOxford New American Dictionary

wacko /ˈwakō, ˈwækoʊ

/ (also whacko) informal, mainly North American

▸ adjective mad; insane:

his willingness to pursue every wacko idea that enters his mind.

▸ noun

(plural wackos)

a crazy person:

a trailer park peopled by exotic wackos and misfits.

– ORIGIN 1970s : from wacky + -o.