back door . back door {n.}, {slang}, {citizen's band radio jargon} Rear of vehicle. I am watching your back door. Categories: add yours cars {citizen's band radio jargon} {n.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: B Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss