one card shy of a (full) deck

one card shy of a (full) deck

A pejorative phrase meaning not very intelligent or of questionable mental capacity. This expression can appear in many different forms and variations (e.g., "a few sandwiches short of a picnic," "one brick short of a load.," etc.). He says he's going to start a business selling bees as pets—I think he may be one card shy of a full deck. The new manager is nice enough, but he's one card shy of a deck, if you ask me.
See also: card, deck, of, one, shy
Farlex Dictionary of Idioms.
See also:
  • a sandwich shy of a picnic
  • one brick short of a (full) load
  • one sandwich shy of a picnic
  • several bricks short of a (full) load
  • several cards short of a (full) deck
  • sandwich
  • one brick shy of a (full) load
  • one brick shy of a load
  • bricks shy of a load
  • a few, two, etc. bricks short of a load