When I was about 12 or 13, I started regularly using an online forum dedicated to a series of strategy games called Total War. I've never liked usernames with lists of numbers and, being 12 or 13, decided to just make up a silly word, "Kromovaracian". It stuck and is still my handle for most forums and discussion boards I go on (though there are a couple of others I sometimes use).
The original word was too long for AB, so I had to reduce it by a couple of characters. Ta daaa.