Micro, short for micro managing. Used in rts (real time stratagy games), where the user has to control many induvidual units, giving each specific directions.
Uber, meaning over, above or dominant.
If someone has uber-micro, they are adept at managing units, and therefore, can own noobs.

Where one uses the keyboard with great speed and accuracy in an RTS game to control multiple units at a time. Some players with extensive ubermicro can control their worker or builder units to build a base whilst also controlling their offensive units.
Apparantly, RTS noobs often forget that the keyboard exists.
This term was made more popular by the internet show purepwnage.

Uber Micro is the ability to be able to command a vast amount of units (men) in rts games (Command and Conquer and Starcraft) This skill if highly recognized amungst gamers (made popular by the hit internet series "Pure Pwnage") and should not be taken lightly.

Used in the Pure Pwnage series (www.purepwnage.com), it is a term used to describe the ability using the keyboard and mouse to control multiple RTS units at once, in this case in Command and Conquer:Zero Hour

Above all, the masterful skill of keyboard management (in RTS or abstractly for every game requiring typeing skills).

Über ==> The word 'Über' is taken from German and is used in exactly the same way by an English slang speaker as a German speaker would. Über in German literally means 'Over' or 'Above' and is often merged with other German words to emphasise their excellence. e.g. "Übersoldat" or "Over-soldier" literally translated. In English, we would sooner say, "Super-soldier", but the meaning is the same.

Micro ==> in strategy games: short form of "micromanagement"
conrast to macro/-management

controlling single units; do as many meaningfull actions as possible; special moves

in matches between 2 players with same tactical skills, the one with the best micro wins

Über Micro ===> like, Über Micro

Made Popular by the Pure Pwnage guy AKA teh Pwnernator AKA teh Pwnerer AKA guy who PWNs alot

Pro-game talk for skills