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1.
To laugh so hard your stomach hurts.
George Carlin was so funny last night I nearly bust a gut.
by tclcttb May 29, 2005
 
2.
Eating a very large meal; eating so much that ones stomach is so full that one feels that it might actually break open. Often times this feeling results in one falling asleep while watching t.v.
I ate so much I thought I might bust a gut.

Let's go to that new Mexican place and bust a gut!
by wichita January 06, 2008