wacko

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Rhymes with -ækəʊ

Etymology tree

English whack

Proto-Indo-European *-kos

Proto-Germanic *-gaz

Proto-West Germanic *-g

Old English -iġ

Middle English -y

English -y

English wack(y)

Latin ō

Old French ohbor.

Middle English o

English O

▲

Middle English o

English oh

English -o

English wacko

From wack(y) + -o.

derogatory, slang An amusingly eccentric or irrational person. “Environmentalist wackos” — Mr. Limbaugh’s phrase — “want man to be responsible for it because they want to control your behavior,” the conservative host said on the show.

UK, dated Hurrah! "Wacko! There's a whole pile of letters for me," Jennings cried excitedly, hopping from one foot to the other.