R's
R or r - Are
RFC - Request For Comment
ROFL - Rolling On Floor Laughing
ROFLMAO - Rolling On The Floor Laughing My A_s Off
ROFLMAOAY - Rolling On The Floor Laughing My A_s Off At You
ROFLMBO - Rolling On Floor Laughing My Butt Off
ROFLMBOAY - Rolling On Floor Laughing My Butt Off At You
RL - Real Life
RSN - Real Soon Now
RT - Real Time
RTSM - Read The Stupid Manual
RU - are you