/ Dictionary / Index S speed freak: Meaning and Definition of Find definitions for: speed' freak" Pronunciation: [key] — Slang. Slang. an addict or habitual user of amphetamines, methamphetamines, or similar stimulating drugs. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. speeder speed gear Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language