R - Are 
R U there? - Are you there 
R&D - Research & Development 
R&R - Rest & Relaxation 
RAEBNC - Read And Enjoy, But No Commen… 
RAEBNC - Read And Enjoyed, But No Comm… 
RAFO - Research & Find Out 
RAOFLMAO - Rolling Around On the Floor… 
RAT - Remotely Activated Trojan 
RB@Ya - Right Back at Ya 
RBAY - Right Back At Ya 
RBAY - Right Back At You 
RBL - Raltime Blackhole List 
RBS - Really Big Screen 
RBTL - Read Between The Lines 
RBY - Red, Blue, Yellow 
RC - Remote Control 
RCI - Rectal Cranial Inversion 
RDWHAHB - Relax, Don't Worry, Have A H… 
Re - Hello again 
RE - Regards 
RE - Reply 
REHI - Hello Again 
rehi - Hi again 
REXMAN - Relax And Enjoy and read the… 
RFC - Request for Comments 
RFD - Request For Discussion 
RFL - Ready For Lunch 
RFMF - Read the Fucking Manual First 
RFR - Really fucking rich