ZOMG is a varient of the all-too-popular acronym "OMG", meaning "Oh My God". ZOMG originated from the imageboard 4chan.org and one of it's members Zardoz.

Always 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 REI-CHAN!!! - A 4Chan user exclaiming sarcastic joy over a picture of Rei from Evangelion.
by Sniffles March 10, 2005

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stands for "Zombies On My Grass" or "Zombies, OMG" in case of zombie invasions.
Bobby: "ZOMG! They're heading this way!"
Shane: "AHHH! ZOMG! Bring out the plants to keep them off my lawn!"
by blah1235829386t98217 May 27, 2011

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Zombies! Oh My God!
Zombie: Grrrrawr
Human: ZOMG, don't eat me!
by wikitreephone March 05, 2010

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originally from starcraft
when the enemy zerg would rush and swarm u with zerglings when u were still harvesting minerals
the acronym means
ZERG O MY GOD
written in the chat as a cry for assistance
Bob:ZOMG
Joe:k ill send over some guys quick
by SCBWFTW May 09, 2009

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A variation of OMG. The 'Z' stands for "zombies". Thus ZOMG is an expression of shock used when one sees a lot of zombies.
"Oh shit, it's the living dead!"
"ZOMG!"
by Scott L.R. April 15, 2007

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An awsome version of OMG. Usually used to mock the people who use the term "OMG" every other sentance.
ZOMG Lets Go Get Some Shoes!
by Freaky Kayla Person January 06, 2007

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It is a a version of omg that mocks it, being that you can accidentaly hit the z key when trying to hit the right shift key fp OMG, from there it developed into an accronym to mock the entire online/l33t language
person 1: OMG i just raped a lvl 21
person 2: ZOMG STFU NOOB!!!
by andrew m June 17, 2006

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