FWIW - for what it's worth
GGP - gotta go pee
bio - same thing
BRB - be right back
AFK - away from keyboard
TBH - to be honest
IRL - in real life
lol, rofl, lmao, roflmao, hehe, heh, kek - forms of laughter
AH - auction house
CoD - Cash on Delivery
MTM - move to me (puller command)
OT - off-tank
MA - main assist, person that chooses kill order
AV - Ashenvale or Alterac Valley
1kN (along with 1k) - Thousand Needles
RR, RRM - Redridge Mountains
BS - Burning Steppes
EF - Elwynn Forest
SG - Searing Gorge
LM - Loch Modan
DM - usually Dire Maul, also Deadmines or Dun Morogh
SS - Southshore (sometimes refering to all of Hilsbrad)
Gaz - Gadgetzan
EPL - Eastern Plaguelands
WPL - Western Plaguelands
LHC - Light's Hope Chapel
AH - Arathi Highlands
HF - Hammerfall
KG - Kargath
GR - Gnomeregan
GS - Goldshire
STM - Stonetalon Mountains
FP - flight point
JB - jailbreak (onyxia key mission for Alliance in BRD)
DME, DMW, DMN - wings of Dire Maul
scarlet (with respect to Stratholme or high-end dungeons) - liveside of Stratholme
Co{X} - Curse of whatever...doom, elements, etc.
JoW - Judgement of Wisdom
FN - Frost Nova
poly (along with sheep) - polymorph
FH - Flash Heal
lock - warlock, as opposed to war for warrior
sleep - hibernate
oomkin - moonkin
SoC - seal of command
Disc - discipline tree
<I could fill an entire novel with class skills, but I don't think we want to dilute the list too badly>
itemization (not naming specific lewtz)
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DW - dual wield
1h/2h - one- or two-handed weapon
DKP - "dragon kill points", point-based system for distributing raid loot
GFPP - greater fire protection potion
GNPP - greater nature protection potion
xbow - crossbow
other
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DC - disconnected
LD - linkdead (same as disconnected)
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Only the exceptions can be exceptional.