/ Dictionary / Index S sidesplitting: Meaning and Definition of Find definitions for: side•split•ting Pronunciation: (sīd'split"ing), [key] — adj. convulsively uproarious: sidesplitting laughter. producing uproarious laughter; extremely funny: sidesplitting farce. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sidesplitting (Thesaurus) sidesplitter side step Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language