Bud developed the fake identity during Al's dream pregnancy in season 6, starting with "If Al Had a Hammer". He told the family that he was going to start junior college and he wanted to start anew, since women love new blood, so he believed that he should try a new persona that he named Grandmaster B. He tells the family that whenever the hat is off, he can be called Bud, but as soon as it's on, he is must be addressed as Grandmaster B, but the family (and some of the girls he ends up meeting) seems to not care and end up butchering his name up in numerous ways.