lock twat 

Its an urban legend that while you are nailing a chick her twat locks up and you can't pull your dick out.

"Dude, did you hear what happened to Sully last night? He was doing his girl and she got lock twat"!!! "Her dad came home and they had to go to the E.R. and get a doctor to release her lock twat".

lock twat by Sully baby March 1, 2009

twat lock 

the female equivalent of a "tea bagging"

After a friend passed out drunk after a party one of the girls at the party put him in a twat lock

twat lock by Tyler Call January 6, 2007