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
- automatic dialler
- automatic direction finder
- automatic following
- automatic frequency control
- automatic gain control
- automatic helmsman
- automaticity
- automatic landing
- automatic machine
- automatic observer
- automatic parachute
- automatic pilot
- automatic shut-off
- automatic stabilizer
- automatic teller
- automatic tension
- automatic train control
- automatic translation
- automatic volume control
- automatic writing
- automation
- automatise
- automatism
- automatist
- automative