PMS

When a woman is going through the pain of one of her internal organs shedding a layer. This may cause her to have a lower tolerance for incompetence and is why pmsing has such negative connotations. If you happen to be the incompetent dingwad that pissed off a pmsing female, be kind to those around you and don't go off complaining about "how much of a bitch she is". Caution: if a girl is angry don't just ask her if she is pmsing. Believe it or not that is one of the most infuriating things someone can say. Its like saying she cant be angry. Even if some shit just went down.