It means teh b3s7 of t3h 1337!

So totally better than you and then some. The best of everything and everyone. So much better than you, your mom, and your dog. Better than 1337, more than 1337, overly 1337, so 1337 it's painful. The best of all and everything and you and your dog.

Contraction of über (also, though incorrectly, known as uber) and 1337.

Über, in German, is a prefix AND a seperate word (Z0MG!) As a seperate word, it can be used as an adverb or a preposition.

Über can also be translated as an adjective such as over, above, and super. The most frequent users of it as an adjective are gamers, chatters, and forum users.

In slang, über is an adjective synonymous with superior, beyond, surpassing, etc. Über retains the meaning from the language it came from, in this case German.
It can be used as an adverb in order to amplify a verb or another adjective's meaning. In may be hyphenated when used in this sense, as shown below.

Defamation: Dear RETARDS, PLEASE stop using über as oober or uber. DON'T think it means "cool," "awesome," or "epic;" IT DOESN'T.

Defenition: The word "über" (Not "UBER" or "OOBER") derives from GERMAN (NOT RUSSIAN FOR TARDS) *Literally* means "ABOVE" or "OVER." It is not American for "very," "cool," or "amazing." It is NOT Russian for "Super," although when combined with other german words it appears to mean super (I.E. Über alles {Above/over all} Übermensch {Superman})

Truth: People are jealous that they got called a retarded poser for not knowing what a word meant, so they told EVERYBODY what they thought it was, and now a whopping 50% of the population believes them.

American-German Trans-langual word: The word über came into American culture by a punk band called "California Über Alles," translating from german "California above all." It came from the common german (NOT Nazi) phrase "Deutschland Über Alles" meaning "Germany above all."

A step over 1337, this is often referred to as "über-leet", for obvious reasons.

EXTREMELY overused words. Most of which are 1337(leet?)speak terms, cliched insults that make people want to scream, and words that nerds use a hell of a lot.
Nerd Terms are extremely annoying, because almost everyone uses them, and because they are just plain bad disses, etc.
And now, Nerd terms have become part of the english language because of a bunch of nerds, and peer pressure, turning nerd terms into a pandemic.