It sounds like the sort of baby talk you would say to a dog while feeding it doggy treats. These noises make total sense if you imagine him making them while dangling a milk bone over a golden retriever.
He's saying how epic he is, and how failtastic everyone else is, and that everyone but him is a fat gay faggot. I mean I can't make out a word, but this is all I've ever heard from video game people that have this tone.