have got a screw loose

have got a screw loose

To be or seem particularly silly, eccentric, crazy, or mentally unstable. (Also worded as "have got a loose screw.") That guy on the corner has definitely got a screw loose because he's been standing out there yelling obscenities at passersby all morning. My old uncle Pete has got a few screws loose, but he's a really nice guy. What's the matter with you? Have you got a screw loose, or what?
See also: have, loose, screw
Farlex Dictionary of Idioms.
See also:
  • have got a loose screw
  • loo
  • screw loose, to have a
  • have a loose screw
  • have a screw loose
  • have a few loose marbles
  • with a loose screw
  • with a screw loose
  • case
  • (as) mad as a March hare