have got a loose screw

have got a loose screw

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