flat-ass

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flat-ass

rude slang Used to emphasize the bluntness or totality of something. Stay away from him, bro. The dude just flat-ass murdered someone because of the way they looked at him. Man, I'm flat-ass broke right now. Can we go out next week after I get paid?
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.

flat-ass

mod. absolutely; totally. (From a general slang term flat-out.) She opened it up as flat-ass fast as it would go.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.