getting absolutely destroyed in some kind of competition or event, usually in a videogame like Halo. pwn is derived from "own" but the o is replaced with a p, whiched is supposed to represent a tongue sticking out, therefore forming the word "pwn". I pwn noobs all day. but back to the uber part, uber is a synonym for "super", but it usually has a negative connotation.
"Daniel pwns Dylon in Halo, but its all fun and games".
When you fail at something in life (eg. failing an exam or not getting a job), go home and spend an hour just standing in the shower, propping yourself up against the wall with your eyes on your feet.
Caleb knew the only thing to do after he didnt get prefect was take a failureshower.