happy slapping
noun [ U ] UK informal uk/ˈhæp.i ˌslæp.ɪŋ/ us/ˈhæp.i ˌslæp.ɪŋ/
快乐掴耳光(攻击他人并将全过程用手机拍照的恶劣行为)
the activity of attacking someone and filming the attack, especially with a mobile phone
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