cap - Capture (a flag or a relic)
EFC - Enemy Flag Carrier
FFC - Friendly Flag Carrier
FC - Flag Carrier
oil - burning oil used by keep defenders; attackers usually don't like oil
ram - Ram used to break the gate of a keep
sc, scen - scenario
ToK - Tome of Knowledge
WC, Wcamp, camp - War Camp
AM - Arch Mage
Blorc, Borc, black, blackie - Black Orc
BW, wiz - Bright Wizard
DK, DoK - Disciple of Khaine
Herd - Squiq Herder
IB - Iron Breaker
Mag - Chaos Magus
Mara, Mar - Marauder
RP - Rune Priest
SH, hunter, hunt, hun, shunt, shun - Shadow Hunter
sham, shammy - Goblin Shaman
SHerd - Squig Herder
SM - Sword Master
Sor, Sorc - Sorcerer or Sorceress
WE - Witch Elf
WH - Witch Hunter
WL - White Lion
WP - Warrior Priest
ZT - Zealot
In scenarios or open PvP you may be told by your team-mates something of the following:
"Kill the healer ffs" - If used by Order player, it means you should focus on taking down the DoK, shammy or zt; if used by Destro it means you should focus on taking down the AM, RP or WP.
"n00b, its a tank!" - You are attacking an opposing tank (IB, SM, Borc or Chosen). Ignore the tank and kill its healer first (no living or unliving thing in WAR can kill a tank being healed)
"FLAG!" - An interesting comment, that may mean many things. Either your FFC is in trouble, the EFC is about to run away, neutral your sides flag is being capped by hostiles, or you should cap the neutral/hostile flag. "FLAG" also does not mean flag only, it can mean a relic or a victory-location too.