gang·bang or
gang-bang 
(g
ăng
b
ăng
′)
n. Vulgar Slang 1. Sexual intercourse forced upon one person by several others in rapid succession.
2. Sexual intercourse involving several people who select and change partners.
v. gang·banged, gang·bang·ing, gang·bangs or gang-banged or gang-bang·ing or gang-bangs
v.intr.1. Vulgar Slang To participate in a gangbang, either consensually or as an aggressor.
2. Slang To participate in violent gang-related activities.
v.tr.Vulgar Slang To subject (someone) to a gangbang.