| Abbreviation | Definition |
|---|---|
| OOM | Order Of Merlin |
| OOPS | Object Oriented Persistent Storage |
| OOPS | Office Of Professional Skimming |
| OOPS | Out Of Print Sorry |
| OOSH | Organization Of Super Heroes |
| OOTD | Only Offer The Donut |
| OOTD | Opera Of The Duchess |
| OOTM | Orange of the Morning |
| OP | Obnoxious Preppie |
| OPA | Other Peoples' Attraction |
| OPAC | Often People Access the Catalog |
| OPAC | Oh, Please Accept Checks |
| OPEC | Obese Penguins Eating Cars |
| OPEC | Office Of Petrol And Electricity Consumption |
| OPEC | Oil Profits Eat Consumers |
| OPEC | Old People Eat Cake |
| OPEC | Old People Eating Chicken |
| OPEC | Ongoing Petrol Energy Crisis |
| OPEC | Only People Eat Cows |
| OPEC | Open Patios Expect Chairs |