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

 

wacko

 adjective
adjective
BrE BrE//ˈwækəʊ//
 
; NAmE NAmE//ˈwækoʊ//
 
(informal) Describing strange traits
 
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crazy; not sensible wacko opinions See related entries: Describing strange traits Word Origin 1970s: from wacky + -o.
See the Oxford Advanced American Dictionary entry: wacko

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