Originates from Blizzard's game Starcraft where zerg were one of 3 playable races, aliens like appeareance, zerg were characterized by using large numbers of weak units to swarm the enemy, also another charasteristic of zerg were that everything was organic, ie, zerg didnt used machines or any artifacts, they would mutate their own buildings from special kind of larvae and advanced units were created by mutating basic ones. Units were cheap to make and it was possible to make extreme numbers in short period of time.

Nowadays term zerg is used in mmo games to describe force consisted of large group of lower level players (often with only basic equipment) who use numbers rather then strategy to defeat the enemy, therefore requiring no skill. This tactics is commonly known as zerging
Last nite we bitchslaped Rifter the overmind and his zerg again.
by Templar July 18, 2004
Overwhelming an enemy with numbers - going for quantity instead of quality, by rushing your opponent with hundreds of millions of players that have little skill.
"Oh noes! Flowers of Happiness have zerged us once again! Luckily we can fend them all off using a couple of skilled players."
by Frostwolf February 2, 2005
when a bunch of talentless noobs get together and try to use large numbers against one target, instead of skill and tactics.
frog rompers just tried to Zerg Xegony, but they got sent to freeport.... again
by h8ter April 17, 2004
To rush the enemy in usually RTS (real time strategy) games such as, Warcraft 3, Starcraft, World in Conflict, and sometimes World of Warcraft during a battleground.
Boy 1: Let's zerg them and go straight to their base!
by Karry? January 8, 2010
zerg is an odd phrasing for the "chosen people" once one hears zerg they can begin to communicate with others who can understand. It's a communication medium for those who are chosen. this strange dialect was first used by marck us' before another tribe of posers led by "keeta" adopted and tarnished it beyond repair. it is being re-established within the "zarn"
i woke up sipping zerg
i am playing zergnite pubG
by kowalski pog July 18, 2022
Zero Experience Required Guild

I made this up many years ago when i did not know what zerg stood for, sorry but i didn't play SC
OMG here come WoD!

Many example of mass zerg alliances can be found in all mmorpgs
by Duclose May 13, 2010
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