Top Definition
greasy residue that accompanies flatulence often after eating rich or oily foods
I just greased my shorts with fart butter.
by Ugly Dave August 28, 2007

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Fartbutter is a fart let out with a little wetness that stays in between the buttcheeks. It makes your buttcheeks slipper, so they slide back and forth as you walk or even run. So as the old saying goes "slippery when wet"
Damn, my ass has enough fartbutter build up in it.

Geesh, when will I let a fart with out the butter?
by fartyuyiorieoirtjo September 15, 2010

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When someone rips a gnarly fart, and it's so thick in the air, that you can cut it like butter. Fart butter is the suggested topping for an air biscuit.
(andy)What the fuck is that smell?

(dick)I don't know what you're talking about.

(andy)Dude, you dropped some serious fart butter in here.

(dick)I don't smell anything; it must be the sewer again.

(andy)Whatever, I'm going outside
by kurtwasright March 05, 2011

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