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a sexual experience/position involving four parties usually 2 males and 2 females. One male lays flat on the ground with an erect penis. the two females then proceed to mount on the mouth and penis. the second male then stands over over the first male in between the two female, whom are facing each other, and receives oral stimulation from both females, orally and anally.
Bob: Hey David! I have two female companions wishing to engage in a quadrilateral.

David: Oh bro I call top!

Bob: Oh darn, I desired a good salad tossing
by quadpro September 20, 2010
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A term for a group sex position formed when four guys penetrate a girl at precise angles.

The term is commonly used by millennials and leaves Randy in a state of confusion and distress.
Gene: "Yeah, man. That's when you hit her with the quadrilateral!"

Randy: Quadrilateral??? What is that???"

Joe: "Hell Yeah! The quadrilateral! Works everytime!"

Randy (Losing his mind): "Quadrilateral??? What the fuck are you guys talking about!!??"
by Jkru94 April 01, 2019
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