Well I only started using the internet in 06 but didn't really start using online accounts until late 08 when I made my youtube account. During that time I was a huge fan of yoshi since he was a combination of two of my favorite things (dinosaurs and the color green) I was just going to put just yoshi but I knew that would've been taken so I added killer in front of it to make it seem more cool. Though I knew that would be taken as well so I added a "s" in the end because I didn't want no numbers on it. It worked and since then stuck to me and I use it with every account I have