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1.
1. An expulsion of air from the anus, accompanied by any quantity of blood.

2. Any amount of blood forcibly expelled from the anus.
Kathy's skirt flapped wildly when she ripped a killer blood fart in the middle of third period gym class.
de Allah Pinya 11 mars 2003
 
2.
The unfortunate spackling of bloody pooh in ones underwear when attempting to pass gas. This is generally caused by being anally penetrated on a regular basis by large hairy men with names like Bruce or Greg.
Poor old Zink could not finish playing Trivial Pursuit, as he had inadvertantly let a bloodfart, completely soiling the insides of his skivvies. He was secretly relieved, however, as he was losing terribly, as usual.
de Anonymous 24 mai 2003
 
3.
what happens when I eat too many doritos
Doritos is the number one leading cause of bfs
de RJ 8 septembre 2003
 
4.
When you injure your butt internally in some way, and it causes you to let out some really acrid farts with the faint smell of metal, like there's blood in them.
Ever since I fell off that stool, I've been having the worst blood farts.
de Alex Stockwell 8 janvier 2008
 
5.
1. the blood-filled, gassy result of sexual penetration during the period of menstration, usually following the 'doggie style' position
2. the bloody gas expelled from a homosexual butt penetration
Man, he sure blew a huge bloodfart after I came and pulled out of his ass.
de weasel 10 février 2003
 
6.
The most amazing, hardcore and non existant band ever!
"Dude, did you see bloodfart last night?!" "Yeah man it was insane!"
de Steven Goatgaggle 24 mars 2013
 
7.
A bloody, mucus-like, sometimes chunky spray emitted from the vagina after rough sex or from one's anus.
Vaginal bloodfarts are common with promiscuous women, whereas an anal bloodfart can be caused from either homosexual penetration or from an infected, cankered meat vein protruding from one's anus (aka hemorrhoid).
Joey's mom sucks bloodfarts out of pregnant chickens.
de jayhawk 19 avril 2004