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a fistula is any type of necrotic hole from one thing to another on the body. Like a bladder to anal fistula, or vaginal to anal. Each more disgusting than the last.
Jesus, that guy had a fistula so bad, that whenever he tried to have sex, he shat out his dick.
fistula by Jake April 21, 2004
Dracula's gay brother. You know, the one that enters your room late at night with a bottle of lube and that cheeky grin that says, 'That's right. I'm all about the ass.'
Did you hear about Donny? Word is that Fistula got to him the other night! Hasn't been able to sit right for a few days!
Fistula by Hektik Slice September 5, 2012

rectovaginal fistula 

A rectovaginal fistula is a medical condition where there is a fistula or abnormal connection between the rectum and the vagina. Rectovaginal fistula may be extremely debilitating. If the opening between the rectum and vagina is wide it will allow both flatulence and feces to escape through the vagina, leading to fecal incontinence. There is an association with recurrent urinary and vaginal infections.

Funniest disease ever!!!

Mike: "I was fucking this girl the other night, when all of a sudden, she just shat out her vagina! It was horrible! I Donkey Punched her and left...
Stu: "Well Mike, what you got yourself there, is a classic case of the ol' rectovaginal fistula".
rectovaginal fistula by Swamp September 19, 2006

fistulas 

when someone sticks a fist in your rectum, then, when puss starts coming out of your anus, you now have crohns deasese. consult a doctor for further instructions
dude i got Fistulas last night.
fistulas by Fry-Guy June 20, 2010

Fistula Sandwich 

A sexual act in which a male takes both his hands and vigorously fists a woman (one hand in the pussy, the other in her ass)
Last night, Jeff gave me a fistula sandwich, but he fisted too hard and now my vagina is bleeding.
Fistula Sandwich by Mr. Ebola September 16, 2017

recto-vaginal fistula

Condition characterized by a small tear or fissure in the tissue separating the rectum from the vaginal canal leading to all sorts of unpleasant mishaps.

See also quart, cooch turds, queefshit.
Rita's recto-vaginal fistula made my cock pop out of her ass while I was pounding her pussy.

Thomas didn't believe Britney had a recto-vaginal fistula, so she squeezed out a series of quarts and cooch turds to convince him.