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The passing of farts between 2 butts, usually through a tube with occasional turds
Guy: "I'll put this end in my butt and you put the other end in yours...then we'll just fart a bunch..."
Girl: "okay baby, I love fartsex!"
Fartsex by dudehellsthis June 18, 2010
Related Words
Anal intercourse that ends with a fart as the ejaculate happens
Has anyone ever farted on you during buttsex? It's called fartsex.
fartsex by Paul Mr.Martini January 30, 2009
When two or more farts have joined aromatic forces in a specific area transforming into one smell that cannot be tolerated by any of the creators.
In a supermarket I released a fart in an isle loaded with people and immediately left the scene. When I returned to observe my victims I noticed there must have been a counter-fart because the area did not smell familiar... it smelled like fartsex.
fartsex by InfernalDante April 11, 2009
Can you stop PEEING ON MY FACE TIMOTHY!?!? Ohhhhhhhh my GOD, your SUCH a fartsel.
Fartsel by bobtheslobthebob February 8, 2021

Fartsetto 

When you fart and a high-pitched squeal comes out instead.
Her fart was so beautifully high-pitched, it was forever deemed a fartsetto.
Fartsetto by shamu11 January 30, 2015

fart sex 

farting into one another's asses.
One day Bart and Suzie went to a Mexican restaurant, they both had refryed beans. And later on that night they were both getting all kinds of feelings. They both had caught a bad case of Gas from the beans. They also wanted to try something waay more kinkier than usual. So Bart layed on his stomach without pants or underwear on. This turned Suzie waaay on. so she took off her pants and underwear and she layed upon Bart butt to butt. And by accident Bart farted into Suzie's ass. This actualy gave her an exciting feeing so then she farted in his. And this continued on through the night. There being fart sex.
fart sex by Aubrey & Danielle October 9, 2008