1. Shut up! 2. To give up or abandon any criminal profession; to quit. "I'm hanging up when I pull (serve) this bit (sentence)." 3. To defer payment with the intention of cheating a creditor. "You ain't hanging me up for my cut (share of the loot)." 4. To commit suicide by hanging. "That dude (fellow) that came on the last boat (transfer of prisoners) is blowing his top (losing his sanity). He'll hang up one of these nights."

- american underworld dictionary - 1950