off the wall off the wall {adj. phr.} Strange; out of the ordinary; stupid. He has been making off-the-wall remarks all day; something must he the matter with him. Categories: add yours {adj. phr.} Source: A Dictionary of American Idioms by A. Makkai, M.T. Boatner, J.E. Gates © 2024 To section: O Subscribe to: American IdiomsIdioms feedEnglish languageHome page and general feed Discuss