The act of releasing a shart (a fart so vicious that it releases an amount of shit from your bowels) and having the resulting residue trickle down your leg(s) after deflecting off any adjacent material that is in contact with your bum.

Projectile shartarrhea- the above, but with the intention of making it public, due to the fact that you are not wearing pants/underwear
I should have eaten some celery with those hot wings, cause I woke up with an intense case of shartarrhea.
by FDR's roommate April 16, 2009
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When you thought you farted and then thought you might have sharted, but actually you had shartarrhea.
My wife had a colonoscopy and fell asleep. Suddenly she woke up when she thought she farted, then she thought she might have sharted, but actually she had shartarrhea.
by FloridaFour April 26, 2019
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