Etymology
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wacko (n.)

extended form of wack, by 1971.

updated on March 21, 2014

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Definitions of wacko from WordNet

wacko (n.)
a person who is regarded as eccentric or mad;
Synonyms: nutter / whacko
From wordnet.princeton.edu, not affiliated with etymonline.

Dictionary entries near wacko

W

W.C.

WAC

wack

wacke

wacko

wacky

wad

wadding

waddle

wade