Possibly the best thing you can call a fat person.
Hey Fatty McButterpants, are you going to down that Big Mac™?
a grotesquely fat man, usually with low IQ and little to no friends.
Fatty McButterpants across the street wants to know if he can have a beer.
1.) One who indulges one self with a grossly amount of desserts
2.) a person who says "derricious" often
4.) a person who smiles and jumps up and down when they see or think of food.
5.) a person who points to another person calling them a Fatty McButterpants
Meng: cookies and ice cream?
Mike: Fatty McButterpants
Sam: Ooo! Ooo! I want some!
Brian: anyone want some lard?