R

R -- Are
RGDS -- Regards
RINGL8 -- Running Late
RLR -- Earlier
RMB -- Ring my bell
ROFL -- Rolling on the floor laughing
ROFLOL -- Rolling on the floor laughing out loud
ROTFLMAO -- Rolling on the floor laughing my ass off
ROTG -- Rolling on the ground
ROTGLMAO -- Rolling on the ground laughing my ass off
RTFM -- Read the flaming manual
RU -- Are you
RU? -- Are you?
RU CMNG -- Are You coming
RUOK -- Are You OK?