bust nuts

bust (one's) nuts

rude slang To work very hard. "Nuts" is a slang term for testicles. I've been busting my nuts studying for this exam, so I really hope I get a good grade.
See also: bust, nuts
Farlex Dictionary of Idioms.

bust nuts

verb
See bust one’s ass to do something
See also: bust, nuts
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • bust (one's) nuts
  • bust nuts to do something
  • bust one’s nuts
  • bust one’s nuts to do something
  • nuts
  • nutz
  • the nuts
  • for nuts
  • you're nuts
  • nuttery