bust your ass/balls/butt/hump

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