work (one's) buns off(redirected from works buns off)
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!