| Abbreviation | Definition |
|---|---|
| OIYB | Oh, It's You Bob |
| OIYGNL | Only If You've Got Nine Lives |
| OJD | Obsessive Jonas Disorder |
| OK | Octopus Kicking |
| OK | Oh Koala |
| OK | Okay Kitty |
| OK | Original Kaos |
| OK | Other Kitty |
| OKFF | Offer Kids French Fries |
| OLB | Obnoxious Little Brother |
| OLDS | Old Ladies Drive Slow |
| OLDSMOBILE | Old Ladies Driving Slow Makes Others Behind Infuriatingly Late Everyday |
| OLE | Object Linking And Embezzling |
| OLG | Obnoxious Little Goofball |
| OLGA | Old Lady Going Anywhere |
| OLH | Old Lady Here |
| OLIVER | On Line Interactive Vicarious Expediter And Responder |
| OLIVER | On-Line Interactive Vicarious Expediter and Responder |
| OLIWIA | Only Like I Would In America |
| OLJ | Obnoxious Little Jerk |