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When someone has a flat stomach only made up of fat.
Person1: Dude look I have a sexy flat stomach

Person2: Naa dude, that's just flat fat
by Kurt Hendrix January 03, 2010
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2
When a really obese people loses a ton of weight in a short amount of time, making their appearance seem pinched or unnaturally small
Damn dude, John's wife lost 300 lbs in a week! What a flat fat!
by Ding_Dong_Long_Schlong December 12, 2016
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