/ Dictionary / Index T thigh-slapper: Meaning and Definition of Find definitions for: thigh-slap•per Pronunciation: (thī'slap"ur), [key] — n. Informal. a very funny joke, remark, story, or incident. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: thigh-slapper (Thesaurus) thigh-high thigmotaxis Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language