be up (one's) ass

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be up (one's) ass

rude slang To be driving too close to another car. Primarily heard in US. Why is this guy up my ass when I'm already going over the speed limit? You look tired. Are you sure you're up for this?
See also: ass, up
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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