Magnum condom-shaped meat locker in your nethers for storing copious amounts of nacho-induced, noxious hot ass gas. See also: Prison Wallet, Gas Chamber, Fart Factory.
Bill: Dude, what is that smell?
Bill’s Friend: Sorry man. Just couldn’t hold that fart in my butt prison any longer.
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Ones asshole that is used to store miscellaneous items
Cole used his prison butt to deliver his mother's refrigerator to her new house