AFK
Away from keys/keyboard.
AoE
Some effect, usually a spell, that affects a group of enemy creatures in an area, either damaging or disabling all of them. Fireball is an example of a damaging AOE.
AOP/OOP
An opportunity of attack. A reaction taken when a creature moves out of melee range.
ASI
Ability Score Improvement. This allows allocation of either 1 or 2 points to ability scores.
A Will
A legal document that expresses a person's wishes as to how their property is to be distributed after their death. Must be purchase of at least 1 GP prior to character's death.
BBEG
Big Bad Evil Guy
BRB
Be right back.
CQC
Close Quarters Combat
When your combat is more up close and personal, ideally used when sessions take place in environments with tight corners and 5-10ft wide corridors
Comp
Complication rolled with a downtime activity. 10% chance to trigger. Commonly rolled as a d10 triggering on a 1
Doing an “Air”
When somebody blows an issue out of proportion and gets mad at people for it.
DM
A dungeon master, the guy who run games for you, appreciate them or else.
DTD
Downtime Days
FOMO
Fear of missing out.
Monthly DTD
Free downtime days that refresh every new month, on your own time zone.
Min-Maxing
Maxing out stats you need and minimizing stats you don't. Ie you're good at one thing and nothing else.
Similar to Munchkin, a player or style that focuses on minimizing unneeded abilities to maximize others. Fighters with 8 INT and 16 STR are a common example.
Murder Hobo
Players/characters who play the game in such a way that their characters kill things, do quests, and move on quickly. Less about roleplaying and more about powering through quests.
OOC
Out of character.
One Shot
A short adventure that typically takes either one game session or a small handful of sessions.
Point Buy
Allocation of 27 points to assign to stats.
Railroading
When a Dungeon Master forces the players down a single specific track of events.
Read the Website/RTW
Head to the website and refamiliarize yourself with the rules.
RP
Roleplay.
Standard Array
Like point buy, but set pre-allocated points per stat.
Variant Rulings
Unique table rules a Dungeon Master may have for the table.