gang bang 
informal
noun
1The successive rape of one person by a group of people.
1.1A sexual orgy involving changes of partner.
2North American An instance of violence involving members of a criminal gang.
verb (gang-bang)
1 [with object] (Of a group of people) rape (someone).
2 (as noun gang-banging) North American The violent activities of a criminal gang.
Derivatives
gang-banger
- general discharge
- general election
- general epistle
- general equivalency degree
- general equivalency diploma
- generaless
- general headquarters
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- generalia
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- general issue
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- generalized anxiety disorder
- generalized coordinate