Game Terms
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Zerg
Refers to being attacked by an overwhelming number of players.
ZOMG
ZOMG is an acronym used in the same context as "OMG!", except the Z does not stand for anything. It was original a typo, as when people type "OMG" they press the left shift key down and inadvertantly hit the Z key as well. It is now often intentionally mispelled, not unlike pwn.
Zone
An area of the game separated by loading from one point to the next. A lot of bugs and glitches resolve around 'zoning'.