A fork of Rural Dictionary
An act performed during a threesome with three gay male participants. The man in the middle is penetrated on both ends, his mobility restricted by the simultaneous thrusts of his partners. This is often performed in a specially built enclosure with two glory holes on opposite walls. The enclosure is also often called a mantrap.
Bob was in a mantrap with John and Mike.
I'm thinking of checking out the new mantrap at the club tonight.