(1) One who overly indulges in consumption
(2) A soon to be tub of lard
(1) Ooohh, I ate too many swiss cake rolls! I'm a fatcake!!
(2) Cameron! You ate an entire XL Papa Johns pizza by yourself? You're going to be a fatcake!!
1. Noun. A person who eats too much fattening food or a fat person.
2. Noun. A fattening snack cake.
1. "Look at that fatcake eating that pizza. Disgusting."
2. "OMG I just ran out of fatcakes T-T"