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An initialism of "out of office," used in business communications when one is not present in their office or at their desk for some period of time. Variously written as "OoO" and "ooo." Enjoy your vacation! Make sure you set up your OOO email before you leave. Sorry, the agent who is handling your case is OoO at the moment, but I will ask her to contact you when she returns.
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.