work someone's butt off

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work someone's butt off (third-person singular simple present works someone's butt off, present participle working someone's butt off, simple past and past participle worked someone's butt off)

1. (Canada, US, vulgar, slang) Synonym of work someone's ass off.
   • 2021 June 11, Stephanie Saul, quoting Melissa Borgioli, “Two Black Students Won School Honors. Then Came the Calls for a Recount.”, in The New York Times‎, →ISSN:

     Her son, Dominic, had been ranked third at the end of his junior year, but had “worked his butt off this year,” she said.