When you play WoW or some other nerd game and you burn your skin. Then you go to school and act like you went to the beach and got a sun-burn. Usually happens when you play 10+ hours.
Nerd: Hey, I went to the beach for like 3 hours and got extreme sunburn!
Cool Guy: Yeah right! Just admit it. We all know that you got nerd-burn. *Laughs*