To give a serious answer, it's a guy who has done an extreme body modification and cut his dick in half right down the middle. This leaves the urethral opening down at the base of the split cock.
He's not the only guy to split his cock in half either.
Here's an interview with "Splitcock":
http://www.bmezine.com/news/people/A...lit/index.html
For more extreme body mods, see:
http://www.sickestsites.com/body_modification.htm