| Abbreviation | Definition |
|---|---|
| ONAG | On Numbers And Games |
| ONAW | One Night At Wheatley's |
| OOE | Out Of Energy |
| OOII | Operation Overkill II |
| OORP | Out Of Role Play |
| OOTD | Order Of The Dragon |
| OOTP | Out of the Park |
| OOTT | Out of the Trunk |
| OOUG | Obscure or Otherwise Unknown Games |
| OP | OverPowered |
| ORAS | Omega Ruby Alpha Sapphire |
| ORG | Orgrimmar (World of Warcraft city) |
| ORP | Open Role Playing |
| ORPA | Oceania Role Players Association |
| OSRS | Old School RuneScape |
| OSVR | Open-Source Virtual Reality |
| OT | “oil team” One of the most feared and fearless clansIn The survival game “Rust” on PC. OT is their c |
| OTCG | Online Trading Card Game |
| OTG | Off to Gaming |
| OTP | Online Team Play |