zOMG is a varient of the all-too-popular acronym "OMG", meaning "Oh My God".
The "z" was originally a mistake while attempting to hit the shift key with the left hand, and type "OMG"
Also used in all-caps, 'ZOMG' is generally used in a sarcastic manner, more often than not a humiliating fasion. It is also used as a device for stating the obvious.
ZOMG was the ruler of the planet XYRZON until 2451 AD, when he was overthrown by KFOP after the battle of SHMUR. the battle marked the violent end to ZOMG'S noble reign as ultra-lord. KFOP soon proved to be an incapable ruler of XYRZON, and the planet collapsed into chaos in 2453. since that day, the residents of XYRZON have used ZOMG as a declaration, nay, an exclaimation of hope. hope that one daypeace shall return to XYRZON, on the shoulders of a truly worthy king.