When a fat person is constantly angry as a way to seek revenge for their obeseity. Often the anger is directed at skinny people and the anger level increases around feeding time.
-What is her problem. She was angery at everybody for no reason.
-It wasn't you, she just has fat anger.
-That would explain it.
(adj) Being in a angry mood because of one's obesity and long term exposure to the resultant feelings of societal rejection. In other words, being perpetually pissed off and bitchy because one is a fatty.
Man, I almost got sideswiped by some fatangry chick driving a Ford Festiva. Is there some sort of inverse proportionality rule where the size of the car is inversely proportional to the size of the driver? Cuz, I'd be pissed too if I weighed 350 and had to squeeze into a Fiesta.