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 buttprison any longer.
May I have an order of regular degular buttermilk pancakes? Without all the added jazz? Hold the blueberry smiley face, strawberry glaze, chocolate chips and whipped cream.