Chat Reference - Acronyms, emoticons, and online chat slang
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OO Acronym 3 Different Meanings

Definition 1 Over and out
Popularity 3 stars  Average
Description
Chat Chat-Specific Acronym  
Information Used when signing off from an email message or online chat session. Also OAO and _O&O_.
Example "That's all for now, I guess. OO."
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Definition 2 On order
Popularity 1 star  Very uncommon
Description
Chat Chat-Specific Acronym  
Information Refers to a product that has been ordered, but has not arrived yet.
Example Suggest an example.
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Definition 3 OpenOffice
Popularity 1 star  Very uncommon
Description
General General Use Acronym  
Information An open-source productivity suite, similar to Microsoft Office.
Example Suggest an example.
back line line OO line line forward