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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.
by Ashley Arnold November 10, 2006
 
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.
by LovevoL February 27, 2008