P

PC - Politically Correct
PD - Public Domain
PDA - Public Display of Affection
PDQ - Pretty Damn Quick
PDS - Please Don't Shoot
PEBCAK - Problem Exists Between Chair And Keyboard
PEBKAC - Problem Exists Between Keyboard And Chair
PIMP - Peeing In My Pants
PITA - Pain In The Ass
PLZ - Please
PM - Private Message
PMFBI - Pardon Me For Butting In
PMFJI - Pardon Me For Jumping In
PMJI - Pardon My Jumping In
POAHF - Put On A Happy Face
POS - Point Of Sale
POS - Pile/Piece Of S***
POSSLQ - Person of Opposite Sex Sharing Living Quarters
POTC - Peck On The Cheek
POETS - P*ss Off Early, Tomorrow's Saturday
POV - Point Of View
PPL - People
PS - Post Script
PU - That stinks

Q

QT - Cutie

R

RE - Regarding
REHI - Hello Again
RFD - Request For Discussion
RHP - Read His/Her Post
RL - Real Life
RMA - Return Merchandise Authorisation
RMA - Registered Members' Area
ROFL - Rolling On Floor Laughing
ROFLASTC - Rolling On Floor Laughing And Scaring The Cat
ROI - Return On Investment
ROTF - Rolling On The Floor
ROTFL - Rolling On The Floor Laughing
ROTFLMAO - Rolling On The Floor Laughing My Ass Off
ROTFLMAOAY - Rolling On The Floor Laughing My Ass Off At You
ROTFUTS - Rolling On The Floor Unable To Speak
RPG - Role-Playing Game
RPTS - RePost That S***/Stuff
RSN - Real Soon Now (i.e. never)
RTFAQ - Read The FAQ
RTFM - Read The F'ing Manual /Message
RTM - Read The Manual /Message
RU? - Are You?
RU4R - Are You For Real?
RUOK - Are You Okay?