A sex act involving 6 males and at least 3 females. The males form a circle and double team the females who overlap each other. While doing so the males all must lock hands in a circle forming what looks to be a coliseum structure.
It's a version of the Eiffel Tower, only better.
Guy1: Dude, last night we all got drunk and there were only 3 chicks there for all us so you know what that means?
Guy2: No, What?
Guy1: ROMAN COLISEUM!!!