It's quite the story.
Back in the golden days of the Call of Duty series when it was still good, i.e Call of Duty: United Offensive, I was looking for a new online nick because I'd grown tired of my extremely childish one which I will write here only to discourage people to do such horrors to other gamers eyes, I was nicked "Cr@zY_b0y" which even to this day haunts my very nightmares.
So, at that very faithful day of changing my name I had a friend over that had played the game "Chronicles of Riddick: Escape from Butcher Bay" (or however all that is spelled) and he was talking about some cardgame or dicegame (wasn't paying attention enough) and mentioned a certain combo you could get where the guy you were playing against would shout out "High Llama", now, for some strange reason, my ears interpreted my friends "High Llama" into "White Llama" and me being Swedish and all thought that the extra l in llama just looks riddick-ulous (see what I did there lulz) and just in the way just decided to write in White Lama and well, when I a few weeks later watched him play that game and notice it was "High Llama" instead of "White Llama" I pretty much reacted with a "Oh, well that's unfortunate." and by then I'd already gotten so used to my new nick and so many of my new friends called me either "White" or "Lama" I couldn't be arsed to change it.
And since then it has stuck with me through most games (except RPG's, seriousfacenames).
Oh, and the _ is just used where I can't use space in my username.
Embedded is a clip of that diceroll that changed my online nick forever.
Oh, and my avatar is just me in a dress with makeup on, because I was bored one day.