Pronounced "show - boo" Its short for Short Bus. A shobu is someone who just isn't that smart. Maybe someone who is a little slower than the rest of us. Basically STUPID. Shobu can be used to describe ones actions or to describe a particular person. Shobu can also be used in place of ones name.
Dude, you're so shobu its not even funny anymore. or Hey shobu, love the black socks and sandles.