The owner of this guide who goes by the name "Toxu" is no longer active, but guide is being preserved due to the quality of it.

I didn't find a thread like this so... im starting one ^^ [And if there is, i ask a mod to delete this]

There Are some Abbreviations that every wow player should know, but, like a baby, you born not taught. [Im sorry for my english :$] So lets teach some newbies:

General:

# AFK - Away from the Keyboard
# DND - Do not Disturb!

# VP - Vote Points

#FFA - Free For All
#ML - Master Looter
#NBG - need before greed

# Nelth - Neltharion Molten Realm
# DW - Deathwing Molten Realm
# Sarg - Sargeras Molten Realm

# WTB [Mechano-hog] - I Want to Buy a [Mechano-hog]
# WTB [Mechano-hog] /w me - I Want to buy a [Mechano-hog] . Whisper me if you have one
# WTB [Mechano-hog] PST me - I Want to buy a [Mechano-hog] . Please Send Tell if you have one
# WTS [Mechano-hog] - I Want to Sell a [Mechano-hog]
# WTT [Mechano-hog] - I Want to Trade a [Mechano-hog] for something else

# LF - Looking For
# [Enchanting] LFW - A enchanter Looking for Work [Getting some Gold]
# DPS LFG - A DPS Looking For Group for a instance/raid
# LFM - Looking For Members for a instance/raid
# LF1 Tank | LF1M Tank - A party leader Looking for a Tank
# 4200 / 4.2k GS DPS LFG - A DPS with 4200 Gearscore Looking for Group
# 4200 / 4.2k GS DPS LFG VH HC - A DPS with 4200 Gearscore Looking for Group for Violet Hold Heroic mode


Professions:

# JC - Jewelcrafting
# LW - Leatherworking
# Herb - Herbalism
# BS - Blacksmithing
# ENG - Engineer
# TL - Tailoring
# ENCH - Enchanting
# ALCH - Alchemy


Skills:

# BOM - Blessing of Might
# BOK - Blessing of Kings
# BOW - Blessing of Widsom
# GBOK - Greater Blessing of Kings
# BOFK- Blessings of Forgoten Kings

Dungeons/Raids:

# HC - Heroic Chain [A run trough all instances in Heroic Dificulty]

# VH - Violet Hold
# COS - Caverns of Time: The Culling of Stratholme
# AN - Azjol-Nerub
# AK - Ahn'kahet: The Old Kingdom
# GD/GUN - Gundrak
# TOC - Trial of the Champion
# FOS - The Forge of Souls
# DTK - Drak'Tharon Keep
# UK - Utgarde Keep
# UP - Utgarde Pinnacle
# HOS - Halls of Stone
# HOL - Halls of Lightning
# POS - Pit of Saron
# HOR - Halls of Reflection

# ICC 10 man - Icecrown Citadel 10 Man Raid
# ICC 25 man - Icecrown Citadel 25 Man Raid

# OS - The Obsidian Sanctum
# NAXX - Naxxramas
# VOA - Vault of Archavon
# TOC / TOGC - Trial of the Crusader
# ICC - Icecrown Citadel
# Ony / OL - Onyxia's Lair
# RS - The Ruby Sanctum


Citys:

# OG - Orgrimmar
# UC - Undercity
# SM - Silvermoon City
# TB - Thunder Bluff
# SW - Stormwind City
# IF - Ironforge
# EX - The Exodar
# DN - Darnassus


BattleGrounds - BG:

# WSG - Warsong Gulch
# EOTS - Eye of the Storm
# AB - Arathi Basin
# AV - Alterac Valley
# IOC - Isle of Conquest
# SOTA - Strand of the Ancients

# WG - Wintergrasp


Dungeon/Raid Classes:

# DPS - Attackers ?? Attack the tank's target
# RDPS - Long Range Attackers [Example: Warlock] ?? Attack the tank's target and, for some raids, RDPS kill adds, etc.
# Main Tank - "The box sack" ?? The player that takes the mobs aggro and suffers damage while being healed by the healers.
# Off-Tank - "The 2nd box sack" ?? The players that takes the secondary mobs aggro [Example: mini spiders of Elder Nadox Boss @ AN]
# 2nd Tank - "The box sack on QQ" ?? The player that is waiting for tanking [when the Main Tank dies].
# Main Healer - "The medic" ?? The player(s) that heals mostly the tank
# Raid Healer - "The medic" ?? The player(s) that heals the party/raid


Classes:

# Paladin - Pala
?? RET - Retribution [DPS]
?? Holy - Holadin [Heal & DPS]
?? PROT - Protection aka Tankadin [Tank]

# Warriors: - War
?? Arms [DPS]
?? Fury [DPS]
?? PROT - Protection [Tank]

# Druids:
?? CAT/KITTY - Feral Combat [DPS]
?? BEAR - Feral Combat [Tank]
?? RESTO - Restoration [Healer]


# Warlock - Lock [DPS]:
?? AFFLI - Affliction
?? DESTRO Destruction
?? DEMO - Demonology

# Death Knight - DK [DPS & TANK]:
?? Blood - TANK @ CATACLYSM
?? Frost
?? Unholy

# Priest:
?? DISC - Discipline [DPS/Healer]
?? Holy [Healer]
?? SH - Shadow [DPS]

# Mage [DPS]:
?? ARC - Arcane
?? Fire
?? Frost


# ?? Neutral Topic
# ?? Working Dungeon/Raid/Battle Ground
# ?? Not Working Dungeon/Raid/Battle Ground [Hold on!]

Some of these Abbreviations may be wrong and some Abbreviations are missing too, so, feel free to reply to correct these list and to add some Abbreviations too!