Shitfart separator

[Justin Bieber]

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 its repeatedly squeezing and [churning] when one has diarrhea. The work of a healthy shitfart separator usually results in dry farts