Que dices, Beck?

I just got the new Beck record Guero. Track 2 "Que Onda Guero?" is a great song (like most of the album), but I can't figure out what it means. If anybody reading this is familiar with Mexican slang (or knows somebody that is) let me know your take on this. The literal , word for word, translation is Que=what, Onda=wave, Guero= blanched/bleached. I know that guero is a mexican slang term that means white or whiteboy, but I don't get the whole sentence means in context. Anyway, regardless of this little bit of Spanish trivia the album is great. As usual the cover art is wonderful too. Go buy it and make Beck richer. He's too thin, he needs the money for food.