fat ass(redirected from a fat ass)
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1. rude slang A large buttocks. What? I think her fat ass is sexy.
2. offensive slang A derogatory term for someone who is fat or obese. Often spelled as one word. You can't have a skinny dude play Santa—you need a fatass for that.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.