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| | OEICs | | open-ended investments |
| | OEM | | Oringinal equipment manufacturer |
| | OFDM | | Orthogonal Frequency Division Multiplexing |
| | OFO | | Out f**king Off |
| | OFS | | One Finger Salute |
| | OFTEL | | Office of Telecommunications |
| | OFTLOG | | Oh for the Love of God |
| | OGC | | Office of Government Commerce |
| | OGKT | | Only God Knows That |
| | OGTDA | | one good turn deserves another |
| | OH&S | | Occupational Health and Safety |
| | OHAC | | own house and car |
| | OHDH | | Old Habits Die Hard |
| | OHG | | Old High German |
| | OHOTKOHOTC | | One Hand On The Keys, One Hand On The Crotch |
| | OHV | | OverHead Valve |
| | ohw | | On Her Way |
| | ohw | | on his way |
| | oicu812 | | oh, i see you ate one too |
| | OICURMT | | Oh I See You Are Empty |
| | OICURMT | | oh, I see you are empty |
| | OIS | | oh I see |
| | OIS | | oh i see! |
| | OIU | | Operator Interface Unit |
| | OJ | | Only Joking |
| | OJ | | Orange Juice |
| | OJT | | on the job training |
| | OKBB | | OKay, Bye Bye |
| | OLAP | | On-Line Analytical Processing |
| | OLAP | | Online Analytical Processing |
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