What is Umbilical Leash?
One of those baby restraints with a rope attached so as to prevent a child from running too far out of reach from his/her parental unit. Also known as the primitive version of GPS.
Baby Boy: Damn my stupid mother. She has locked me up in her outdoor jail with this stupid umbilical leash.
Baby Girl: That's too bad because if you could just take 3 steps further, I'll give you the time of your life.