bad egg . bad egg {n.}, {slang} A ne'er-do-well; good-for nothing; a habitual offender. The judge sent the bad egg to prison at last. Contrast: GOOD EGG. Categories: add yours {n.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: B Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Post my comment