A person who carries around all your belongings when going out. i.e wallet, phone, keys. He is responsible for all of these things and is responsible if anything is lost.
You can also have your life caddy answer your phone calls, responds to texts, and pay for your drinks at the bar from the money in your wallet that he is currently holding.
I'm defiantly going to need a life caddy for my 21st birthday, i don't want to lose my phone