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.
2. When you let one ripin your pants and one of your hard nuggets cuts the inside of your anus(Your colon), and your ass bleeds really bad.
This is usually very visible, and everyone will know when it happens, and trust us, it WILL happen.
Last night at the club I made a bloody fart in my pants while I was grinding this chick, she totally ran away.
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