1. Any person, guilty or innocent, who takes full blame to shield others. 2. A fool; a bungling criminal; a stupid tool of crafty criminals. "These stirs (prisons) are full of fall guys and squares (accidental criminals). All the hip (smart) ghees (fellows) hit the counties (country jails) or the street (win acquittals or bribe their way out)."

- american underworld dictionary - 1950