To pwn to the highest degree. Even higher than an ultra pwn
Guy 1: Wow u just pwned that guy
Guy 2: More like uber pwned
To pwn, or overcome, such as that he who receives the pwning is utterly shattered destroyed, tarnished, mauled and annihilated without clemency.
Person 1: I uber pwned James at CoD WaW yesterday.
Person 2: Wow, he must really be bad, because you are terrible.