| O | Over (to you) |
| OATUS | On A Totally Unrelated Subject |
| OAUS | On An Unrelated Subject |
| OB | Obligatory (frequently Ob) |
| OBTW | Oh |
| OD | OverDose; Oh Dear |
| OFO | Out F---ing Off |
| OFS | One Finger Salute |
| OIC | Oh |
| OMFG | Oh My F---ing God! |
| OMG | Oh My God! |
| ONNA | Oh No |
| ONNTA | Oh No |
| OO | Over and Out |
| OOSOOM | Out Of Sight |
| OOTB | Out Of The Box |
| OOTC | Obligatory On Topic Comment |
| OPL | Obvious Panty Line |
| OPM | Other People's Money |
| OPP | Other People's Problems |
| OSIF | Oh S--- |
| OSIM | Oh Shoot It's Monday |
| OSU | Officially Sanctioned User |
| OT | Off Topic |
| OT1H | On The One Hand |
| OTBE | Over Taken By Events (orig. military) |
| OTC | Over The Counter |
| OTD | Out The Door |
| OTF | On The Floor |
| OTFM | Only The Facts, Mam |
| OTK | Over The Knee |
| OTL | Out To Lunch |
| OTOH | On The Other Hand; On The One Hand |
| OTOOH | On The Other Other Hand |
| OTT | Over The Top |
| OTTH | On The Third Hand |
| OTTOMH | Off The Top Of My Head |
| OTTOMHAROO | Off the Top of My Head and Rolling Out of Bounds |
| OTTOMHAROOB | Off the Top of My Head and Rolling Out of Bounds |
| OTW | On The Whole |
| OW | Oh Well |
| OWTTE | Or Words To That Effect |
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Unless otherwise noted, all photos and text is Copyright © Richard G Lowe, Jr.