/ Dictionary / Index C coffin nail: Meaning and Definition of Find definitions for: cof'fin nail" Pronunciation: [key] — Slang. Slang. a cigarette. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. coffinite Coff 's Harbour Related Content Daily Word Quiz: agitated Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language