on someone's ass
- idiom
- Offensive
- If we don't get this right, Walter will be out on his ass in two weeks, and so will we.
Examples
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Hey, you just stay on my ass and maybe in a couple of miles we'll get a signal.
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- Stay on my ass!
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I got city officials on my ass day and night.
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I had some cops on my ass.
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Why is everyone on my ass?
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I got the FBI on my ass now.
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Better stay on his ass, and don't lose 'em.
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If I don't win this festival, I'm out on my ass.
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He's just gettin' on my ass.
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My boss is always on my ass about finishing the project on time.
Synonyms
To tell someone angrily that you do not like what they did
Antonyms
How Persistent
Surface Forms
Morphology
The literal constituents ('on' + possessive + 'ass') suggest physical position, but the MWE's meaning 'to pressure or nag someone' is a metaphorical extension (being physically on someone maps to pestering or pressuring) that is not fully predictable from the parts for a B1 learner. Similar patterns exist (e.g., 'on someone's back'), which gives a partial cue, but the specific pragmatic sense and vulgar register make it only partially transparent.
Etymology
On someone's ass comes from the picture of someone sitting on or crowding another person's ass, meaning the 'butt'. That's why the phrase now means 'to put pressure on someone' or 'to keep demanding action'.