out of a paper bag

(one's) way out of a paper bag

A phrase use emphasize that one is particularly dim-witted, unintelligent, incompetent, or unable to do something basic, simple, or straightforward. Jeff's new boyfriend sure says some dumb things. The dude probably couldn't find his way out of a paper bag. Don't assign that project to her, she couldn't punch her way out of a paper bag!
See also: bag, of, out, paper, way
Farlex Dictionary of Idioms.

someone couldn't — their way out of a paper bag

a person is completely unable to do something, either through ineptitude or weakness. informal
1999 Time Out N.Y. The problem is, he also, at the time, loved Victoria Tennant , and she can't act her way out of a paper bag even if you soak it with a hose first.
See also: bag, of, out, paper
Farlex Partner Idioms Dictionary
See also:
  • (one's) way out of a paper bag
  • (one's) way out of a wet paper bag
  • couldn't find (one's) way out of a paper bag
  • airbrain
  • airhead
  • pumpkin head
  • smurfbrain
  • airheaded
  • dim bulb
  • dim