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work (one's) arse off
rude slang To work really hard (on or at something). Primarily heard in UK. I know you thought it was just a silly New Year's resolution, but I've been working my arse off at the gym! Sally and Jim work their arses off when we hold our user conference—I don't know what I'd do without them!
work your arse off
BRITISH, VERY RUDE or work your ass off
AMERICAN, RUDEIf you work your arse off, you work very hard. He's working his arse off to make the shop his triumph. I'm working my ass off to get to where I need to be.
work your ˈarse off
(British English) (American English work your ˈass off) (taboo, slang) work very hard