English

Definition of wacko noun from the Oxford Advanced Learner's Dictionary

 

wacko

 noun
noun
BrE BrE//ˈwækəʊ//
 
; NAmE NAmE//ˈwækoʊ//
 
(informal)
 
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(pl. wackos, wackoes) (especially North American English) a crazy person Word Origin 1970s: from wacky + -o.
See the Oxford Advanced American Dictionary entry: wacko

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