something that is uproariously funny, as a joke or a situation.
uproar, panic, hoot, laugh, howl, show, sensation, revelry, carousal, wow, splash, lark, frolic, extravaganza, festivity, merrymaking, confusion, excess, flourish, smash
Origin of sidesplitter
1875–80; from the idiom to split one's sides (laughing); see -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019