Motherboy is an annual mother-son dinner and dance event. Lucille and Buster have participated in it for many years. It is not to be confused with the '70s rock band Motherboy. Motherboy's theme song appears at the end of the episode.
At the thirtieth Motherboy gala Lucille took George Michael because she was afraid to be seen with Buster since his lost his left hand. Michael and Buster then snuck into the event to rescue George Michael. Caught in the act, Buster and Lucille made up and went on to win "saddest couple". ("Motherboy XXX")
Together we will finally be
You and me, mother and boy
Hanging free, oh woe is me
Alone but for the loveliest girl in the world: mother
Upon her knee
So fine to be
Mother and boy
MotherboyFrom "At Long Last... Music and Songs from Arrested Development"