What's the deal with your nickname? How did you get it? If your nickname is self-explanatory, then tell everyone when you first started using the internet, and what was the first thing that made you say "wow, this isn't just a place for freaks after all?" Was it a website? Was it an email from a long-lost friend? Go on, spill it.
Back in high school, my best friend was talking about me. A mutual friend overheard him and asked if he was talking about me: "Are you talking about Pat Mobley?"
"I'm talking about Phat Lobley, I don't know about you," he replied, spawning a beast of a nickname that survives to this day.
I just figue it's cute and clever (albeit in a spontaneous, had-to-be-there kind of way), so why not be known by it to denizens of the interweb?