Twas a random creation that is always free on every site I go to (probably because it is a stupid name). But lets break it down (or rather, I'll break it down all by myself).
Demo=Demolition-as in the destruction of buildings or demolition derbys (the old redneck pastime)
man=my gender, if you couldn't figure that out
chaos=another word for mass destruction, which is what I tend to do in most video games
Though despite my name being almost all about destroying stuff, I am really a nice fellow who is not easily aggravated.