1 Jail's version of pussy
2 A man's asshole
3 incarcerated pussy
Bubba: boy howdy you are lookin fine joey!
Joey the Rapist: thanks my nigg you know i enjoy keeping in shape.
Bubba: nice ass, back where i come from we call that thurr prison pussy!
Joey the Rapist: thanks i guess...
(anal rape almost always follows a conversation with the word "prison pussy")