/ Dictionary / Index D dirty pool: Meaning and Definition of Find definitions for: dirt'y pool' Pronunciation: [key] — Informal. Informal. unethical, unfair, or unsportsmanlike conduct. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dirty old man dirty rice 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