work (one's) buns off

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work (one's) buns off

To work really hard (on or at something). ("Buns" is a slang term for the buttocks.) I know you thought it was just a silly New Year's resolution, but I've been working my buns off at the gym! Sally and Jim work their buns off when we hold our consumer conference each year. I don't know what I'd do without them!
See also: buns, off, work

work one’s buns off

verb
See also: buns, off, work