Mine is an old fraternity nickname that I use on the web for all the forums I post on (Google it and you'll see my other interests, it's out there a lot). The first part is my official fraternity nickname, and the last part was a last name added by one of the older members during a drunken episode one evening. There's a few more parts to it:
Dr. Teflon James (Jimmy) Jones
Trust me, you don't want me to explain the whole thing and it would make one heck of a long username.