Meaning of “be up sb's ass” in the English Dictionary

british dictionary

"be up sb's ass" in British English

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be up sb's ass

mainly US offensive

to be driving too close to the car in front of you:

I had a sports car up my ass for the first 50 miles.

(Definition of “be up sb's ass” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)