My mom used to call me Tushy Face. Actually she still does. We'll be in a store and she'll shout "Tushy Face!" to get my attention. It doesn't even phase me anymore. People also called me Care Bear, or just Bear.
I have tons of nicknames for my LO. Usually something like Sugar Poo, Rosie Poo, Rosie Posie, etc. I picture myself doing what my mom did and calling "Rosie Poo!" really loud in a store when LO is 13.
Did you have a nickname? Did you give one to LO?