| Abbreviation | Definition |
|---|---|
| RCS | Roller Coaster Syndrome |
| RF | Real Fuzzy |
| RF | Really Fast |
| RGDS | Regards |
| RJ | Really Joking |
| RKT | Wrecked |
| RMT | Rude Moronic Twit |
| ROFL | Rolling On Floor Laughing |
| ROFL | Rolling On the Floor, Laughing |
| ROFLACGU | Rolling On Floor Laughing And Can't Get Up |
| ROTFL | Rolling On The Floor Laughing |
| ROTFLBTCDICAJTTWADBSIHPWTRHITSBKABAYB | Rolling on the floor laughing biting the carpet dancing in circles and jumping through the window almost dieing by smashing into HP who's then running horrified into the street beeing killed accidenta |
| ROTFWL | Rolling On The Floor With Laughter |
| RPD | Rapid |
| RPLY | Reply |
| RQ | Real Quick |
| RR | Repeat Reminder |
| RRD | Radiant, Radical, and Dynamic |
| RRT | Request Remailing To .... |
| RSN | Real Soon Now |