The Florida Alligator Trap is when one woman, lying on her back, is scissoring another woman lying in a similar position. When either woman is close to climax they will clench their legs down forcefully locking each other in place.
Girl #1: So, did you and Tanya get at it last night?
Girl #2: Oh yeah, she pulled the florida alligator trap
Girl #1: Damn that sneaky motherfucker