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.
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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.
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