on someone's ass

== English == === Alternative forms === on someone's butt === Prepositional phrase === on someone's ass (Canada, US, colloquial, vulgar) Rapidly chasing or pursuing someone. (Canada, US, colloquial, vulgar) Tailgating someone. (Canada, US, colloquial, vulgar) Persistently urging someone on and putting pressure on them. Coordinate term: up someone's ass ==== Usage notes ==== The term is usually considered disrespectful and contemptuous in formal settings, but is often used positively in informal settings. === See also === === References === “be on someone's ass”, in Cambridge English Dictionary, Cambridge, Cambridgeshire: Cambridge University Press, 1999–present. “on one’s ass”, in Merriam-Webster Online Dictionary, Springfield, Mass.: Merriam-Webster, 1996–present.