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A person who looks thin but can eat like a pig and still stay mostly thin. They have flabby arms like a grandma who eats cake for breakfast.
"I can eat a whole pizza and still look fine. You? You look like a balloon.", @PizzaLover42
"She’s thin, but her arms are like sausages. I call her P. F. M. D.", @ArmGang
DM: "You think you’re fit? I could eat you and still be fit.", @FitOrNot