When a lot of people (usually in an online game) get together and run around while apparently waiting for something.

OR
The name of the monster under your bed.
"Yeah man, we are defiantly zerging tonight!"

"Mommy? I think Zerg is back under my bed."
by Stebraul February 08, 2009
A rush of excitement
I was like ZERG when she told me she was DTF.
by LongGoneJohn April 07, 2009
The most popular race used today in Star Craft, or it's expansion set, Star Craft Brood War. Zerg are the most commonly used race because of it's ability to rapidly spawn small pack animals known as 'Zerglings' wich are used to swarm opponents and win.
"Dude, I was GOING to win but Mike_23 swarmed me with zergling!"

"Hey man, I just owned a guy with my zerglings!"
by Ancient-One November 25, 2003
It's like a bunch of people in an MMO, created from the name of a race in the game StarCraft. People who use this word are complete nerds with no life.
Woot! Our 3l33t zerg force pwned your ass.
by Lord Argnot (Level 125) January 12, 2005

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