A fork of Rural Dictionary
A joke about people who are trying to become DJs/Producer/Music Industry Worker, that they sound more "in the biz" or knowledgable about music on goings by instead of calling Skrillex by his stage name they prefer to refer to him as "Sonny" (his real name) as if they know him personally. Same joke can be applied to any celebrity or star with a stage name / alias.
John: I went to this gig last night, shit was lit.
Mike: Who was playing?
John: Skrillex.
Mike: Oh, you mean Sonny?
So it's, in my opinion, a better way to say: "you mean the world to me" because the universe is infinitely greater, bigger, and stronger than just the world. "And a half" is the basic meaning of it, where in this case, you'd use it as a way to say that something is very good, large, etc. ( in a positive sense, of course).
"You mean a universe and a half to me"