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ROFL
rolling on the floor laughing
ROFLMAO
rolling over the floor laughing my ass of
RBTL
read between the lines
RMM
read my mail
RN
right now
RSN
real soon now
RTFAQS
read the frequently asked questions
RTM
read the manual
RU
are you ?
RUOK
are you ok?
RTFM
read the f'ing manual
REGS
regards