Celtic Heroes

Sk - super knowledge elixers (4x xp)
Pota - restoration pots
Alts -booka tht reset skills
Rebirth - reset stats
Y.O.L.O - you only lock once :p (some rose slang)
Plat - premium in game currency
Lixes - any form of elixer
Lux -out of luxary shop

lix- using an elixir
resto- restoration potion
rb- rockbelly
main- 6 star boss
ph- placeholder boss
bh- bonehead

I'll add one we rangers of elite use when a bola misses on a boss we anounce, Av.

Av= avoided

Another I didn't see yet is add

Add= an extra mob entered into the boss fight. Usualy said to get dps to stop on boss and kill the add that's atacking a Druid.

noob = someone new to the game

OR

noob = someone who has been playing the game a long time but still suck at it

I prefer the 2nd definition.

I use the word "newb" or "newbie" to refer to new players.

I like this. Clearly, the OP is trying to learn about the game so he/she is a newbie but not a noob.

I think I have included most slang terminology that is used in CH.

http://celticheroesfanatics.wikia.com/wiki/Terminology