K(OK), i might be the first one to describe all the abbreviations i've seen in my life in games (at least i haven't found any on the internet).
The gameres would say
"Duh, we dnt (don't) need this: it's ur (our) lng (language)"
Agree, it is their language. But i remember how hard it was for me at the beggining to understand WTH (what the hell) are they takin (talking) bout (about)?!
So i hope new people to the online games will find this article useful:
here are some i came across in ma voyages online and that i managed to decode>>>
k > OK
Cya > see you (american way)
u> you
urs > yours
thx > thanks
gratz > congratulations
how ar u?> how are you?
brb> Be right back
afk> away from keybord
omw> on my way
OMG!> yelling Oh MY GOD
OMFG!> angry yelling as previous but with the use of badwords
LOL> laughing out loud
lmao> laughing my ass off
lmfao> no comments :-X
lfp> looking for people
wtb> want to buy
wts> want to sell
wtt> want to trade
y?> why?
ppl> people
bb> bye bye (also booty bay in WOW)
com> come
hp> hit points
kul> cool
xp> experience
gl> good luck
gj> good job
cu> see you (europenian way)
mb> mana breake (all players that use mana will say it to you)
w8> wait
ltr> later
m8> mate
pls> please
wht> what
SW> in WOW Stormwind - the human's capital.
nm> nevermind
wb> welcome back
gw> guild wars
adding some more
atm> at the moment
wtf> rude expression i have no intentions to define :-p. feel free to use it when you're angry.

hope this blog will be usefull for all Neophytes to the Wold Of Warcraft and other online games!

p.s this blog will be modificated as i remember some more of them. feel free to share your own experience.