bust (one's) gut(redirected from busts their gut)
bust (one's) gut
1. slang To put forth a great deal of effort. I've been busting my gut trying to get a passing grade this semester. Don't bust your gut trying to please these people—they'll never appreciate it.
2. slang To start laughing suddenly or uncontrollably. To convey this meaning, the phrase can also be expanded to "bust one's gut laughing." The kids busted their guts when the clown fell down on stage. I nearly bust my gut laughing at that comedy show—I could barely breathe!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.