oddball . oddball {n.}, {slang}, {informal} An eccentric person; one who doesn't act like everyone else. John is an oddball — he never invites anyone. Categories: add yours {informal} {n.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 » In RussianTo section: O Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Comment on this entry