A syndrome for somebody who has no ass, or lack there of.
Poor Johnny has FAS (Flat ass syndrome) and there's no cure for it as of yet.
by ( I ) March 6, 2009
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When you get so broke that eating nothing makes your ass skinny.
Guy #1: Daaaamn, girl got no back.

Guy #2: Why dat?

Guy #1: She flat-ass broke, man.
by RockStar2012 February 13, 2011
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oikawa’s flat ass. it’s ridiculous.
person 1: omfg look at oikawa’s flat ass
person 2: what a loser
by shobiostars October 5, 2021
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An old man,well past any sex appeal(if he even had any) Who insists on bending over -REAL Obvious to show his sad flat butt cheeks in khakis or other tight pants,at any given opportunity.Usually does this display where women(or men)will be seeing this
damn,my boss keeps bending over every time i am near,He's a flat ass flasher
by hot Ethel June 30, 2011
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