| Abbreviation | Definition |
|---|---|
| RUH | Ridiculously Unbelievably Happy |
| RUJ | aRe yoU Joking? |
| RUK | aRe yoU Kidding? |
| RUKM | Are You Kidding Me? |
| RUM | Received Urgent Message |
| RUMA | Right Up My Alley |
| RUMORF | Are You Male Or Female |
| RUN | Are You In? |
| RUN | Race Until Now |
| RUOK | Are you OK? |
| RUPO | Rumor Until Proven Otherwise |
| RUVS | Remote Underwater Video Surveillance |
| RW | Read and Write |
| RW | Rewind |
| RWC | Rich Web Chat |
| RWD | Respond With Details |
| RWF | Reply When Free |
| RWI | Run With It |
| RWIF | Remembering What I Forgot |
| RWJ | Ray Willliam Johnson |