Fart grease – The sticky, foul smelling substance that builds up in the crack of your ass. It’s made up of a concoction of feces, sweat, smegma and lint..
My roommate is so nasty. He picks his ass, waits a few seconds and looks to see if anyone is around, then sniffs the fart grease on his fingers.
by Trav October 01, 2004

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