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.

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

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

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.

The Ability To do more than one thing, used in games. originated from the word micro-management. Few people can uber micro Properly. Used in the popular film, Pure Pwnage.

Being Uber Pro at using a mouse and keyboard. Especialy in Zero Hour and other RTSs

Not just the ability to be pro with a mouse and keyboard, but to be so uber with them that you can play at least four games at once and pwn.