OO Acronym

Meaning	Over and out
Popularity
Usage	Email Online Chat Text Messaging
Description	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."
Updated: January 6, 2009

Meaning	On order
Popularity
Usage	General Email
Description	Refers to a product that has been ordered, but has not arrived yet. May be seen on e-commerce sites or in order status reports.
Example	"The current status of the computer system is: OO."
Updated: January 6, 2009

Meaning	OpenOffice
Popularity
Usage	General
Description	An open-source productivity suite, similar to Microsoft Office. Technically referred to as "OpenOffice.org."
Example	"OO includes Writer, Calc, Impress, Draw, and Base."
Updated: January 6, 2009

http://www.chatslang.com/meaning/oo