bust a nut

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bust a nut ‎(third-person singular simple present busts a nut, present participle busting a nut, simple past and past participle busted a nut)

  1. (idiomatic, slang, vulgar) To ejaculate.
  2. (idiomatic, slang, vulgar) to work very hard, put in a lot of effort


(work very hard): bust one's balls