a sarcastic affirmation, especially useful for dissin annoying, uncool individuals (ya know, the ones who think they are your friends, but deep inside they annoy the hell out of you)
similar to saying, "Yeah, great idea! NOT!"
Annoying, Uncool Individual: "Instead of Burger King they should call it Booger King."
You reply sarcastically: "Fo shizzle, whackadizzle."
All your cool friends laugh.