not have two brain cells to rub together

not have two brain cells to rub together

To be particularly stupid; to lack any intelligence or common sense. Oh please, that fool doesn't have two brain cells to rub together—there's no way he could pull off such an elaborate plan!
See also: brain, cell, have, not, rub, together, two
Farlex Dictionary of Idioms.
See also:
  • not have two (something) to rub together
  • not have two brain cells, pennies, etc. to rub together
  • not have two to rub together
  • rub up
  • not have two nickels to rub together
  • rub of the green
  • the rub of the green
  • fool
  • rub the wrong way, to
  • rub off