| Acronym |
Meaning |
| O&O |
Over and out |
| OA |
Over acting |
| OAO |
Over and out |
| OAR |
On a roll |
| OFC |
Of course |
| OFL |
Out for lunch |
| OIC |
Oh, I see |
| OICN |
Oh, I see now |
| OK |
One kiss |
| OL |
Old lady |
| OLPC |
One Laptop Per Child |
| OLTL |
One Life to Live |
| OM |
Old man |
| OMD |
Oh my darn! |
| OMDB |
Over my dead body |
| OMFG |
Oh my freaking gosh |
| OMFGAZ |
Oh my freaking gosh and zounds |
| OMFGYASB |
Oy my freaking gosh, you're a sexy beast |
| OMG |
Oh my gosh |
| OMGROFLMAO |
Oh my gosh, rolling on the floor laughing my a** off |
| OMGYS |
Oh my gosh you suck |
| OML |
Oh my L... |
| OMM |
On my mind |
| OMOHOD |
One minute, one hour, one day |
| OMW |
On my way |
| ONL |
Online |
| ONNA |
Oh no, not again |
| ONYD |
Oh no you didn't |
| OO |
On order |
| OO |
OpenOffice |
| OO |
Over and out |
| OOC |
Out of character |
| OOT |
Out of topic |
| OOTB |
Out of the box |
| OOYFM |
Out of your freaking mind |
| OT |
Off topic |
| OT |
Other topic |
| OT |
Overtime |
| OTFLMAO |
On the floor laughing my a** off |
| OTGL |
On the ground laughing |
| OTL |
Out to lunch |
| OTOH |
On the other hand |
| OTP |
On the phone |
| OTT |
Over the top |
| OTTH |
On the third hand |
| OTW |
Off to work |
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