couldn't find (one's) way out of a paper bag

couldn't find (one's) way out of a paper bag

Particularly dim-witted, unintelligent, or incompetent; unable to do something basic, simple, or straightforward. A: "How's the new intern working out?" B: "He's a nice kid, but he couldn't find his way out of a paper bag!" Jeff's new boyfriend sure says some dumb things. The dude probably couldn't find his way out of a paper bag.
See also: bag, find, of, out, paper, way
Farlex Dictionary of Idioms.
See also:
  • (one's) way out of a paper bag
  • out of a paper bag
  • (one's) way out of a wet paper bag
  • airbrain
  • airhead
  • smurfbrain
  • pumpkin head
  • airheaded
  • dim bulb
  • dim