prison lips
Used to describe when a man has a nice set of dick sucking lips.
That's a nice set of prison lips you have boy. Now get over here and suck my dick.
Prison lip
Taking your dip out of your lip and hiding it inside your foreskin until the coast is clear and safe to return to your mouth.
I had a fat dip in when my wife came home. I tucked it in my prison lip and went to the garage where I threw it back in.