work your ass off

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work (one's) ass off

rude slang To work really hard (on or at something). I know you thought it was just a silly New Year's resolution, but I've been working my ass off at the gym! Sally and Jim work their asses off when we hold our user conference—I don't know what I'd do without them!
See also: ass, off, work

work your ass (or butt) off

work extremely hard. North American vulgar slang
See also: ass, off, work