Definition from Wiktionary, the free dictionary
- An abbreviation for hugs, usually placed at the end of a letter or in text messaging; often placed alongside xxx.
- The little boy put ooo at the end of his letter to Grandma, to let her know he loved her.
- An abbreviation for Out of Office, a phrase often used in professional contexts to indicate that someone is unavailable for work (usually because they are on vacation).
- Bob is OOO today; let's ask Susie to help us with these TPS reports instead.