I have at last found a group who raps about Dragon Ball Z worse than Soulja Boy. The first video sounds to have been written on ecstasy and the second is pretty much the same thing with added and more risque (though still quite happy sounding) verses by the first guy's henchmen (the one by Pest is my favorite) ._.
To complete an analogy; ByrdBoy is like Kid Buu to Ceddybu's Majin Buu. This guy is Super Buu. Soulja Boy isn't any Buu, although he probably looks like one, just like he looks like every other anime character.