abbreviation for out of office: a reply that can be automatically sent to an email that you have received when you are not in the office and cannot reply personally, or the system for sending such a reply

For fun OOO messages, they have created an Out of Office generator. 他们开发了一款“不在办公室”生成器，可以发出各种好玩的OOO信息。

I've put my OOO on. 我已经打开了”不在办公室“的自动回复。