Loot
The treasure from a chest or a monster that has been killed, or the act of taking such treasure.
LOS
Line of Sight. Often used to mean breaking the line of sight between an NPC and a player, causing it to run towards the player.
Mag
Magtheridon's Lair. A 25-man raid instance of Hellfire Citadel
Mara
Maraudon, an instance in Desolace
Mech
The Mechanar, a Tempest Keep instance in Netherstorm
MgT
Magisters' Terrace, an instance on the Isle of Quel'Danas
MMO
Massively Multiplayer Online
MMOG
Massively Multiplayer Online Game
MMORPG
Massively Multiplayer Online Role Playing Game
MOB
From Mobile Object Block. Computer controlled character. Usually used in reference to any enemy NPC
MT
Main Tank. Also Mana-Tombs, an Auchindoun instance in Terokkar Forest. Also, miss tell, when a message is sent to the wrong person or channel on accident.
Named
A special monster that has a name instead of a generic descriptor. Usually stronger than surrounding monsters with possible special abilities and item drops.
Nerf
To reduce the effectiveness of a class, spell, ability, or item
Newb
Short for newbie, or new player. Suggests that a player is not very good
Newbie
A term that sometimes means new player. Newbie is also used to suggest that a player is not very good
Ninja
Taking an item, usually loot, without permission or agreement.
Noob
Short for newbie, or new player. Suggests that a player is not very good
NPC
Non player character. The characters are controlled by the server or realm. A "computer" character.
OMW
On My Way