| Abbreviation | Definition |
|---|---|
| OICU | Oh I see you |
| OIDIA | Oops I Did It Again |
| OIMG | Oh I Might Go |
| OIS | Oh, I See! |
| OIS | Only In Spain |
| OITC | One In The Chamber |
| OITG | Open In The Groove |
| OIYD | Only In Your Dreams |
| OJ | Oh Joy! |
| OJ | Only Joking |
| OJ | Overly Jealous |
| OJOJ | Only Joking, Only Joking |
| ojoj | only joking, only joking... |
| OK | Off to Kinderhook |
| OK | Okidoki |
| OKAU | Oh Kay And Useable |
| OKTT | OK To Talk To |
| OKZ | Okay's |
| OL | On Line |
| OL | Online |