| Abbreviation | Definition |
|---|---|
| OFF | Organisation For Funk |
| OFF | Organization For Funk |
| OFLA | Obscure Four-Letter Acronym |
| OGB | Original Gangster Ben |
| OGD | Original Gangsta Dawg |
| OGSF | Online Global Shopping Festival |
| OGT | Original Gangsta Tool |
| OHC | Original Harlem Crips |
| OHD | Olive Hoo Dink |
| OHIO | Old Hicks in Outhouse |
| OHIO | Only Hills In Ohio |
| OHO | One Horse Outfit |
| OHR | Official Hamster Republic |
| OHS | One Hip Sista |
| OHW | Old Haggard Witch |
| OIC | Organization of Impotent Countries |
| OICURMT | Oh I See You Are Empty |
| OINK | Online Information Network Knowledgebase |
| OIT | Occult Institute of Technology |
| OIT | Old Indian Trick |