(slang, Canada, US, vulgar) To work very hard, to put in a lot of effort. / (slang, vulgar) To hurt or beat up.

(idiomatic, vulgar) to work very hard; to put in a lot of effort.

(slang, vulgar) to seriously irritate or nag someone. / (slang, vulgar) to tease or ridicule someone; to take the piss out of someone.

(Australia, slang) With extreme vigour and enthusiasm, where quality may be considered. However, efforts involve high risk, and therefore the potential for adverse outcomes. Vision exceeds regard for due care and consideration.

(slang, vulgar) Alternative form of bust one's ass

Alternative form of bust someone's balls

(Canada, US, slang) To work very hard; to put in strenuous effort.

(slang, Canada, US) To work exceptionally hard.

(gambling, slang) A cheat who surreptitiously exchanges normal dice with crooked ones such as "busters".

plural of bust-out man