| OBTW | Oh, By The Way | - | Sms Text Smileys and Emoticons |
| OIC | Oh I See | - | Sms Text Smileys and Emoticons |
| OLL | Online Love | - | Sms Text Smileys and Emoticons |
| OMDB | Over My Dead Body | - | Sms Text Smileys and Emoticons |
| OMG | Oh My God | - | Sms Text Smileys and Emoticons |
| OMG | Oh My Gosh | - | Sms Text Smileys and Emoticons |
| ONNA | Oh No, Not Again | - | Sms Text Smileys and Emoticons |
| OOC | Out Of Character | - | Sms Text Smileys and Emoticons |
| OOTO | Out Of The Office | - | Sms Text Smileys and Emoticons |
| OT | Off Topic | - | Sms Text Smileys and Emoticons |
| OTF | Off The Floor | - | Sms Text Smileys and Emoticons |
| OTOH | On The Other Hand | - | Sms Text Smileys and Emoticons |
| OTT | Over The Top | - | Sms Text Smileys and Emoticons |
| OTTH | On The Third Hand | - | Sms Text Smileys and Emoticons |
| OTTOMH | Off The Top Of My Head | - | Sms Text Smileys and Emoticons |
