/ Dictionary / Index M mickey mouse: Meaning and Definition of Find definitions for: mick'ey mouse" Pronunciation: [key] trite and commercially slick in character; corny: mickey mouse music. useless, insignificant, or worthless: mickey mouse activities just to fill up one's time. trivial or petty: mickey mouse regulations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Mickey Mickiewicz Related Content Daily Word Quiz: crutiny Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language