| Abbreviation | Definition |
|---|---|
| OBAMA | Originally Born in Africa to Manage America |
| OBD | Older Brother Device |
| OBEED | Obsessive Boiled Egg Eating Disorder |
| OBG | Old Buff Guy |
| OBIE | Orange Black Is Everything |
| OBK | Old But Krazy |
| OBN | Obnoxiously Big Nose |
| OBND | Old But Not Dead |
| OBO | Oh Baby Oh |
| OBP | One Big Punch |
| OBVIOUSLY | Overly Boisterous, Vicious Idiots Of Urban Swedish Lineage Yakking |
| OC | Orrible Children |
| OC | Outrageous Chaos |
| OC | Outta Control |
| OC | Overrated Claptrap |
| OCC | Over-the-Counter Choppers (generic false teeth) |
| OCD | Obsessive Crazy Doctors |
| OCD | Obviously Corporate Dummies |
| OCDE | OCDE is me. O - head, C - arms, D - Belly, E - legs |
| OCF | Obsessive-Compulsive Flirt |