It's his screen name in kanji.
For the meaning of that, look here:
http://www.freedict.com/onldict/jap.htmlJust type his screen name in and you'll understand. I'm somewhat hoping that the person he fed this to already got this tattooed on her arm or something.
(Apologies to Kintama for pointing people to where they can understand his name, but...funny is funny.)