/ Dictionary / Index D diddly-squat: Meaning and Definition of Find definitions for: did•dly-squat Pronunciation: (did'lē-skwot"), [key] — n. Slang. doodly-squat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: diddly-squat (Thesaurus) diddlyshit Diderot Related Content Daily Word Quiz: immense Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language