couldn't [act] way out of a paper bag

couldn't [act/argue/fight] your way out of a paper bag

  (humorous)
if someone couldn't act, argue, fight etc. their way out of a paper bag, they act, argue, fight etc. very badly It's no good asking Jim to protect you - he couldn't fight his way out of a paper bag.
See also: bag, of, out, paper, way
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