An obsession with food. A person who plans their day around meals but who does not necessarily have to be overweight. Generally, they are obsessed with all types of food especially any food that can be dipped and the dips themselves. Ice cream, cookies, everything chocolate, and cake are favorites of a person with fatgirlism.
Hannah: Tomorrow we will go the game at 1 o'clock that way we be able to go to breakfast at noon beforehand.
Rosey: That sounds delicious. And then we can hit up the snack bar while we're at the game.
Hannah: By the time the game is over, we can go to dinner!
Mutual friend: Stop talking about food! You're acting like you have fatgirlism.