/ Dictionary / Index D dirty old man: Meaning and Definition of Find definitions for: dirt'y old" man' Pronunciation: [key] — Informal. Informal. a mature or elderly man with lewd or obscene preoccupations. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dirty-minded dirty pool Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language