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".
by Sully baby March 01, 2009