a1-5	Act 1 through 5. This indicates someone's interest in doing all the acts from 1 through 5.
a1	Act 1. This typically is used in naming public games
andy	Andriel. The big baddy at the end of Act 1.
afk	Away from keyboard
apii	All phenomena is illusion
Baal	Baal. This one tends to keep his full name even in slang.
brb	Be right back
cya	See ya
cu	See you
Dia	Diablo. The big baddy at the end of Act 4.
drops	The items which drop when a monster dies.
dru	Druid
Dur.	Duriel. The big baddy at the end of Act 2.
gg	Good Gaming
inv	Invite. Typically used in games to align a party so that each shares in the experience and in the completion of goals.
k	Okay
lol	laugh out loud
Meph Runs	Mephisto Runs. The habit of going into games and killing Mephisto over and over again to get drops.
meph	Mephisto. The big baddy at the end of Act 3.
mf	Magic Finding. This is both the % magic finding bestowed by devices and the act of souping up a character with high mf ability to hunt for special items.
np	No Problem
nvm	Never Mind
party up	A polite demand that you get your act together and join the party.
pk	Player Killer or Player Killing. This is the weird habit of some players killing other players.
plz	Please
pp	Party Please. Asking to be invited into an existing party
q5	Quest 5. Each act has 6 quests. On occasions when someone wants to refer to a specific quest they will either use the number or a name related. For example "Bloodraven" will refer to that quest. Or the quest number can be used.
sc	Small Charm. When carried in your inventory will bestow attributes and powers, etc.
sorc	Sorceress
sup	What's Up
tp	Teleport
wp	Way Point
wtf	What the F**k? Usually means something happened that is outside the norms. Either someone is misbehaving or something weird has just occurred.
zon	Amazon