Definition of party pooper noun from the Oxford Advanced Learner's Dictionary

 

party pooper

 noun
noun
BrE BrE//ˈpɑːti puːpə(r)//
 
; NAmE NAmE//ˈpɑːrti puːpər//
 
(informal)
 
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a person who does not want to take part in an enjoyable activity and spoils the fun for other people
See the Oxford Advanced American Dictionary entry: party pooper