/ Dictionary / Index M M.Y.O.B.: Meaning and Definition of Find definitions for: M.Y.O.B. Pronunciation: [key] mind your own business. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. myoatrophy myoblast Related Content Daily Word Quiz: gregarious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language