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

 

cuckoo

 adjective
adjective
BrE BrE//ˈkʊkuː//
 
; NAmE NAmE//ˈkʊkuː//
 
Describing strange traits
 
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[not before noun] (old-fashioned, informal) crazy See related entries: Describing strange traits Word Origin Middle English: from Old French cucu, imitative of its call.
See the Oxford Advanced American Dictionary entry: cuckoo