Well, I was watching Avatar: The last airbender, and they have a flying bison named Appa. I put appa as the beginning of my name. I noticed that appa, sounded like oppo, so I added sum, like opposum. I had Appasum. Asum sounds like Awesome, so I changed it to Awesome. AppAwesome. I then noticed it had App in it, so I capitalized the A. And I remember it having to do with awesomepposum or something...
If you say appawesome out loud, it sounds like opposum.