side·split·ting
adj. 1. Convulsively hearty; uproarious.
Is side-splitting hyphenated?
Anything that makes you laugh out loud can be described as sidesplitting. ... Originally spelled with a hyphen, side-splitting, and defined as "affecting with compulsive laugher," it first appeared around 1820.
What is side-splitting?
adjective. convulsively uproarious: sidesplitting laughter. producing uproarious laughter; extremely funny: sidesplitting farce.