I've been using this screenname for pretty much everything for the last 10 years. When I find something good I like to stick with it!
It's a nickname my stepsister gave me in reference to the fairytale character "Thumbelina". (Hans Christian Anderson - Pretty good actually!)
Since then, multiple variations of this nickname have popped up, such as "crazalina", when I'm acting loony or "dumbelina", when I'm acting... well, just look at my signature!