It's generally a really fat and lonely kid. They tend to not have friends and are always laughed at.
Furthermore, they have a computer in their kitchen because they're too fat to get up to make a sandwich. (and they have a big jar full of potatoes right beside their screen for no reason).
Next, all they do with their like is play games over the net with people from Korea, such as Starcraft of Starcraft II and are huge douchebags.
All in all, they're white chubby kids with a receading hairline (aka balding at the age of 17) and are named the "Top YuGiOh Champion" because they beat 8 years in the game and feel special when really they're are a huge piece of shit.
Their nickname also includes "Fatgot Phamporg", for: Fat Faggot Phantom Vampire Cyborg.