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

 

prat

 noun
noun
BrE BrE//præt//
 
; NAmE NAmE//præt//
 
(British English, informal) Stupid
 
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a stupid person He got drunk and made a complete prat of himself. You look a right prat in that outfit. See related entries: Stupid Word Origin mid 16th cent. (originally referring to a person's buttocks): of unknown origin. The current sense dates from the 1960s.