Out of office. Used in email and calendar status to indicate that someone is away from work — on holiday, at a conference, or otherwise unavailable. Most email clients have a built-in "OOO auto-reply" feature that fires this notice back at anyone who emails you while you're away.
I'm OOO from Friday through next Wednesday — please loop in my colleague for anything urgent.
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Viral internet speak — memes, ratios, main-character moments, and the algospeak of every platform from Twitter to Reddit to TikTok comment sections.
See all Internet & Memes slang on Slangora.
Browse all slang words starting with O.
Out of the loop. Used to admit you don't know what a current discussion, joke, controversy or meme is referring to, usually as a polite preface to a question. Reddit has a dedicated r/OutOfTheLoop community built entirely around this opener.
(US, slang) A brief glance or visual examination (typically of a person).
(UK) An expression of surprise or befuddlement.
A lengthened spelling of "so" used in texting and social posts to mark emphasis, drama, or anticipation. The number of O's scales with intensity — "sooo good" is mild, "sooooo good" is a level up. Has been universal across SMS, Twitter, TikTok captions, and Bluesky since at least the early 2010s.