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| | ONNTA | | Oh No, Not This Again |
| | ONO | | or near offer |
| | ONOH | | On the Other Hand |
| | ONS | | One Night Stand |
| | ONUD | | Oh No You Didn't |
| | ONUD | | oh nuh uh!! |
| | OO2U | | Option Open to You |
| | OOAD | | Object Oriented Analysis and Design |
| | OOAK | | One Of A Kind |
| | OOAK | | One of a kind creation |
| | OOBE | | out of the box experience |
| | OOD,OOD | | Out Of Debt, Out Of Danger |
| | OOE | | out of endurance |
| | OOF | | Out Of the Office |
| | ooh | | on one hand |
| | OOI | | out of interest |
| | OOIE | | Object-Oriented Information Engineering |
| | OOL | | out of line |
| | OOL | | out of luck |
| | OOMPR | | Out Of My Price Range |
| | ooo | | out of office |
| | ooo | | Out Of Order |
| | ooo | | out of the office |
| | oop | | object oriented programming |
| | oop | | out of power |
| | oop | | out of print |
| | OOS | | Out of Stock |
| | oosom | | out of sight out of mind |
| | OOSOOM | | Out Of Sight Out Of Mind |
| | OOSOOM | | Out Of Sight, Out Of Mind |
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