split a gut

split a/(one's) gut

To laugh uproariously or hysterically; to laugh so hard that it causes one's sides to hurt. Your jokes are perfect for your speech tonight. You'll have them splitting their guts! I was splitting a gut listening to your uncle's hilarious stories.
See also: gut, split
Farlex Dictionary of Idioms.

split a gut

 and bust a gut 
1. Fig. Inf. to laugh very hard. He laughed until he nearly split a gut. The clown made me bust a gut laughing.
2. Fig. Inf. to work very hard. I split a gut to get this place fixed up in a week. Don't bust a gut cleaning up for me. I love things that are a bit messy.
See also: gut, split
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

split a gut

1. tv. to laugh very hard. He laughed until he nearly split a gut.
2. tv. to work very hard. Don’t split a gut for me. I love things that are falling apart.
See also: gut, split
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • split a/(one's) gut
  • have people rolling in the aisles
  • have (one) rolling in the aisles
  • laugh (one's) head off
  • have (someone) laughing in the aisles
  • raise a laugh
  • raise a laugh/smile
  • laugh until you cry
  • for a laugh