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
- light into
- lightish
- lightless
- light-like
- lightly
- light machine gun
- light meter
- light middleweight
- light-minded
- light-mindedness
- lightness
- lightning
- lightning bug
- lightning chess
- lightning conductor
- lightning fence
- lightning never strikes twice in the same place
- lightning rod
- lightning strike
- light opera
- light out
- light pen
- light pollution
- lightproof
- light railway