Well, Guest was right, it
is slang for awesome..
German for the word "above", but more commonly used on the internet for being the best, the top, the supreme, the highest of highest.
-http://www.urbandictionary.com/define.php?term=uber
There's a gourmet burger joint in Singapore called Uberburger, check it out if you don't mind paying S$101 for a hamburger. =p
sincerely, Pennycake