1)Its where you have a fart so bad that your pretty sure that your ass is not only blowing shit but blood as well.
2)When you let a fart loose that is very tiny but burns the nostrils of every one in the room and lingers for days.
3)A fart so bad that it nearly turns the white walls brown
Oh man my nose is burning from that awful smell. Yea the new guy just snuck a bradly