bust a gut to do something
bust a gut
1. slang To put forth a great deal of effort. I've been busting a gut trying to get a passing grade this semester, so failing by two measly points is incredibly frustrating. Don't bust a 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 a gut laughing." The kids busted a gut when the clown fell down on stage. I nearly bust a gut laughing at that comedy show—I could barely breathe!
3. To react furiously and/or violently, to the point of losing control of one's behavior. Mom totally busted a gut when I told her I had failed math. Don't bust a gut, it's just a tiny scratch on the car.
bust a gut (to do something)
tv. to make a great effort (to do something). (Usually objectionable.) I busted a gut trying to get just the thing you wanted!