This is what the tank hears when the priest says:

AFK = Attack! Fight! Kill! = priest wants you to pull more mobs
BIO = Bring In Others = priest wants you to pull more mobs
OOM! = Onward, Onward More! = priest wants you to pull more mobs
MANA = Move Ahead Need to Attack = priest wants you to pull more mobs
Drinking = priest is so bored he wants a beer, pull mobs faster
ADD = Accelerate Death Dealing = priest wants you to pull mobs faster
HELP = Handling Everything Lets Proceed = priest wants you to pull more mobs
WIPE = Was Instructed to Pull Everything = priest told you to pull every mob in sight, admits it was all their fault for not healing

WTF! = Well Thought out Fight! = priest applauds your tactical genius