bust (one's) ass (to do something) and break one's balls to do something; bust one's butt to do something; bust one's nuts to do something
Theme: EFFORT
tr. to work very hard to do something. (The expressions with balls and nuts are said typically, but not necessarily, of a male. Potentially offensive. Use only with discretion.)I've been busting my nuts to get this thing done on time, and now they don't want it!You are expected to bust your nuts every minute you are at work.