Causing convulsive fits of laughter; extremely funny. Cf. to split one's sides at side, n.1 phrases 6.

That convulses.

transferred and figurative. Tending to excite screams of laughter; said esp. of a farce.

Of a laugh: uproarious, unrestrained, hearty. Of a joke, act, show, etc.: uproariously or boisterously funny, hilarious.

Of a laugh: uproarious, unrestrained, hearty. Of a joke: uproariously or boisterously funny, hilarious. Cf. boffo, adj.2