When someone has a very fat ass, or is fat in general, or eats a lot, its
traditional to call them a fat ass. There are several scenerios in which you can use this term.
When someone is taking up all the space in
the locker room, you can call them a fat ass.
When someone is hogging all the food in parties, you can call them a fat ass.
When someone is named Rohan or Debdip, you can call them a fat ass.
When someone is squeezing you
in the car and taking up all the space, you can call them a fat ass
Whenever you see someone you hate, you can call them a fat ass.