in his latest single, he makes a crazy video. after reading the lyrics, apparently they rap about why circumcision should not be forced in africa, or else you will be titled "evil boy", hence the name of the video
Die Antwoord - Evil Boy from Billy Deathmetal on Vimeo.
here are the lyrics for anyone who cares...
http://www.boingboing.net/2010/10/07/die-antwoord-evil-bo-1.html