What is Mad-fat?
1.
overweight and angry
The mad-fat lady infront of me in the grocery line who keeps rolling her eyes and complaining about the line being too long so she eats straight from her buggy.
2.
A chiding, comical statement made to laugh off over-eating or the need/desire to eat.
A: That was some good-ass pizza, let me get another slice!
B: You mad-fat, son.
See