A nickname for people with S's and E's in there name. Usually used between friends, boyfriend and girlfriend, and parents and small children. If you are given this nickname you are automatically the best person in the whole world and everyone loves you. You are shy with people you don't know, but once you come out of your shell everyone sees how truly amazing you are. A person called SleeSlee is secretly wild and crazy on the inside.
Person 1: "Did you see that super hot girl?"
Person 2: "Yeah, she's such a sleeslee!"
Person A: "You know that girl who barly talks?"
Person B: "Yeah, she's actally really awesome! She's just a little shy; she's a sleeslee."