flat on one's ass

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flat on (one's) ass

rude slang On one's buttocks. Usually used to describe one's resting position after a fall. Oh, those steps were a sheet of ice—I fell flat on my ass!
See also: ass, flat, on
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

(flat) on one’s ass

1. mod. completely exhausted. (Usually objectionable.) I’m just flat on my ass. I need some rest.
2. mod. broke; financially destroyed. (Usually objectionable. An elaboration of flat broke.) Sorry, I can’t help you. I’m broke—flat on my ass.
See also: ass, flat, on
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.