knocked out knocked out {adj.}, {slang} Intoxicated; drugged; out of one's mind. Jim sounds so incoherent, he must be knocked out. Categories: add yours {adj.} {slang} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: K Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Add my comment