/ Dictionary / Index M mucky: Meaning and Definition of Find definitions for: muck•y Pronunciation: (muk'ē), [key] — muck•i•er, muck•i•est. of or like muck. filthy, dirty, or slimy. a mucky story. obscene:a mucky story. nasty; mean or contemptible:a mucky trick. (of weather) oppressively humid. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mucky (Thesaurus) muckworm mucluc Related Content Daily Word Quiz: longevity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language