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1.
Unintentional escape of shit while passing gas. Typically occurs while trying to fart at early stage of diarrhea.
Man, I farshitted my pants again! sooo embarrasing...
by Mr. U-be-U May 19, 2008
 
2.
when you fart and shit comes out
omg tommy did u just farshit!
by Janie Thomas April 27, 2009