/ Dictionary / Index F fast buck: Meaning and Definition of Find definitions for: fast' buck' Pronunciation: [key] — Slang. Slang. money made easily or quickly and sometimes unscrupulously:Also called He speculated briefly in the commodities market in the hope of making a fast buck. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fast-breeder reactor fast-count Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language