coffin nail . coffin nail {n.}, {slang} A cigarette. "I stopped smoking," Algernon said. "In fact, I haven't had a coffin nail in well over a year." Categories: add yours {n.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: C Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Leave my opinion