The word "Pubster" is used to describe any one being participating in any online multiplayer game, and is being a complete and utter dick sucking jackass to the other sane players, because he/she cannot control their temper due to the fact that they have no life.
Also, the word "Pubster" can be used to describe any person who is against or frowns upon WoW Players.
"WHAT THE FUCK?! I 1DEAGED YOU, THIS REG SUCKS ASS."...."Wow, that guys a Pubster"
"WoW IS SOOO GAY, WHY WOULD YOU PAY 15$ A MONTH TO PLAY THAT SHIT GAME? YOUR SO GAY!"...."Okay Pubster."