To beat someone's ass means to physically thrash or defeat them decisively — to win a fight so thoroughly there's no question about it. It's American vernacular at its most direct, used both to describe actual physical confrontations and as hyperbolic trash talk. You'll hear it in arguments, competitive sports smack talk, and dramatic retellings of altercations. It can also be used figuratively when one thing crushes another completely, like a team beating another team's ass on the scoreboard.
Talk all you want, but step on the court and I will beat your ass in front of everyone.
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(US, idiomatic, vulgar) To thrash someone.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.