/ Dictionary / Index M my-my: Meaning and Definition of Find definitions for: my-my Pronunciation: (mī'mī'), [key] — interj. my (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mylonite myna Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language