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3.
AKA SFS The shit fart separator is the divice inside your ass that separates your shit from your farts. Without this divice everything turns into a shart.
Dude are you trying to fart.
No man im testing my shit fart separator.
by RedlegArtillerymen August 21, 2008
 
1.
The shit-fart separator (AKA shitfart separator) is the muscle inside your colon, just above your bunghole, that is responsible for separating shits from farts. Usually a dormant muscle, the shit-fart separator is often only noticed if it's repeatedly squeezing and churning when one has diarrhea. The work of a healthy shit-fart separator usually results in dry farts.

I had bad diarrhea, and my shit-fart separator was in overdrive.

My shit-fart separator failed me and I accidentally sharted a little in my underwear.
by Flambo Blumpkin February 14, 2008
 
2.
The shitfart separator is the muscle inside your colon, just above your bunghole, that is responsible for separating shits from farts. Usually a dormant muscle, the shitfart separator is often only noticed if it's repeatedly squeezing and churning when one has diarrhea. The work of a healthy shitfart separator usually results in dry farts
I had the Big D, and my shitfart separator was in overdrive.

My shitfart separator failed me and I accidentally sharted a little in my underwear.
by Flambo Blumpkin February 13, 2008