Wiktionary
bust a nut
vb. 1 (context idiomatic slang vulgar English) To ejaculate. 2 (context idiomatic slang vulgar English) to work very hard, put in a lot of effort
Wikipedia
Bust a Nut
Bust a Nut is the fourth studio album by Tesla, released in 1994. It was their final studio album on Geffen Records before the band split. The album was certified gold by RIAA on March 16, 1995.