No, he's a kid who can't stop playing Unreal Tournament and hasn't yet grown a pair of stable testicles.
Angry German Kid (a.k.a. Der echte Gangster, Slikk or Leopold) is a talented actor of age 15 from Bergisches Land, Germany. He plays a character, Der echte Gangster, a parody of a wannabe gangster. This fact has often been misunderstood, and as a result he has been subject to bullying both on- and offline (e.g. school). For this very reason, he stopped making videos for almost a year in 2006.
Sources (translated, click "SCHLIESSEN" if add comes up):
From his blog:
http://www.was-willst-du-tun.de/I am not mad (translated)
"I am not sick or mad, I only have a sense of humor not everyone immediately understands. In addition, I have acting talent. I can do something so real that many think it is real. For this reason I will be insulted by many and hated. The aim of my videos or movies is to entertain people, not provoke. Nobody should take my short videos on the Internet seriously - they are merely for entertainment. No matter what people think or say, I am a very normal boy with acting talent."
- N. K. (aka "Slikk" or "Der echte Gangster")
Video information:
This video was made as a response to some German politicians attempting to restrict access to violent video games. He was trying to show how they view gamers. Very amusing and intelligent. Too bad most people missed the point.
"Journalists" from Focus TV (Germany) used this as an example of an internet addict, claiming the kid to have been secretly taped by his father and to be undergoing therapy in addiction clinic. Naturally, this was not what "Leopold" understood to have agreed on when he gave approval for airing it on TV.
Source (translated, click "SCHLIESSEN" if add comes up):
http://www.youtube.com/watch?v=kBVmfIUR1DAThe proof is in the description.
