The sudden, uncontrolled openening of the sfinchter muscles, letting out an unexpected expulsion of blood from the anus. Like a period, only from another opening.

An over trusted fart that scares you into immediately dropping your shorts and checking your undergarments. What you see will bring the word fear to a whole new level, as the mess in your underwear will force you to believe that you have just aborted the child you never knew you had.

When a girl is on her menstrual cycle and farts.