gang-bang (n.)youdaoicibaDictYouDict[gang-bang 词源字典]
1953, "group sex" (especially many men on one woman or girl, regardless of consent), from gang + bang (v.) in its slang, "perform sexual intercourse" sense. Earlier was gang-shag (1927). Sense of "participate in a street gang" is by 1968. Related: Gang-banger; gang-banging.[gang-bang etymology, gang-bang origin, 英语词源]