bust
a busted flush someone or something that has not fulfilled expectations; a failure. US informal
☞ In the game of poker, a busted flush is a sequence of cards of one suit that you fail to complete.
bust your (or someone's) ass: seeass.
bust your (or someone's) chops: seechop.
bust a gut make a strenuous effort. informal.
2001David MoodyAutumn I don't want to bust a gut building something up if we're just going to end up prisoners here.
fit to bust with great energy.
2008Salmagundi She ushered me into the dentist's lair, where I found him laughing fit to bust, and the nurse had a fit of uncontrollable giggling of her own.