Top Definition
V. Similar to "shart"-ing, having fartarrhea is when a person thinks he or she is passing gas, but a gentle brown mist is expelled from the anus, creating a Jackson Pollock in the underwear. (See Jackson Pollock)
Susan and her friends were drinking soda when she was stricken with fartarrhea. Her shit stank!
by Haggerty January 06, 2008

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When you think you're about to pass gas, but instead you have explosive diarrhea. This is a more severe form of sharting.
Suzy: Wasn't Jim wearing different pants this morning?
Karim: Yeah, but the food from that sketchy hot dog stand gave him unexpected fartarrhea and he had to change.
by Fuzz28 June 26, 2014

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Occurs when a person underestimates their own fart, thinking it is just gas but lets the fart out and diarrhea also sprays out usually making a big mess.
Tracy sat on the couch. She felt a big fart coming. She shrugged and slowly let it out. After she farted, she felt better but she noticed her underwear felt wet and her pants had a big brown stain along with the couch. That's when she realized it and said "damn i had a case of fartarrhea and shit myself"!
by jokester75 February 28, 2014

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When you have diarrhea but you fart while it's coming out and it splatters all over the bowl.
Person 1: "Dude how was your night?"
Person 2: "I had to clean up some fartarrhea, I hate that"
by An anonymous person guy December 07, 2016

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