Definition of happy slapping noun from the Oxford Advanced Learner's Dictionary

 

happy slapping

 noun
noun
BrE
 
; NAmE
 
(British English)[uncountable]
 
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the practice of several people attacking somebody while another person in the group makes a film of the attack A victim of happy slapping hit back at one of the attackers and broke her ribs. Schools banned camera phones because of the happy slapping craze. a happy slapping video