OMGN
OMGN definition by Slang.net - The Slang Dictionary
This page explains what the acronym "OMGN" means. The definition, example, and related terms listed above have been manually compiled and written by the Slang.net team.
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Gamers use OMGN as shorthand for "oh my gosh, noob." This acronym is a quick way of expressing dismay at a noob's incompetence.
If you're repeatedly receiving OMGN in chat, you may want to quit the game you're playing. Most likely, the players you are playing with are big ol' jerks, and you can find better teammates if you join a different game. (Unless you're playing League of Legends. Then, there's no helping you.)