Meta (Slang) Know Your Meme

Meta, also known as Metagaming, is a slang expression used to describe something that’s self-referencing. In informal use of the term found online, meta is used to describe a thing about itself, such as a comment referring to another comment or a meme about memes. In gaming, meta is usually intended to explain the optimal build or strategy and is frequently used as shorthand for the acronym “Most Effective Tactic Available.” Although its use is common among esports, MMOs or other competitive multiplayer games, the term commonly appears online in a range of various uses.

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O RLY: Know Your Meme Classics, In this classic Know Your Meme episode, scientist Elspethjane looks into the origin of O RLY?, internet slang for OH REALLY? with heavy sarcasm.

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What does the phrase 'so meta' mean? : r/OutOfTheLoop