bust your ass

bust (one's) ass

rude slang To work very hard. I've been busting my ass studying for this exam, so I really hope I get a good grade. We can't blow off Holly's party—she's been busting her ass cooking and cleaning and getting everything ready for company.
See also: ass, bust

bust your ass

try very hard to do something.
See also: ass, bust

bust your ˈass/ˈballs/ˈbutt/ˈhump

(American English, taboo, slang) make a very great effort: I bust my ass to get that job.I’ve been busting my hump for the last week trying to get the project finished.
See also: ass, ball, bust, butt, hump