WIP = Work in progress
DNP = Do not post ( usually accompanied by WIP )
Tube of you = Youtube
GTG / G2G = Got to go
BBL = Be back later
Poof = To log out for a short time, usually to complete a task in real life
DA / D@ = Deviantart
Mods = Moderators
Newbie = A kind way of addressing a new member
Noob = A slightly mocking way of addressing a new member
n00b = An insult
OC = Original character
PTSP = Post to see post
I'll add more later.