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.
Early on, got tired of trying to pick user names, and xxxx172 wasn't an option. This sounded nice in my head, and figured likelihood of someone else having used it was pretty low.