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.

Meta-Frameworks: How Should We Think About Frameworks Themselves? (Book Chapter 1), by Rhys Lindmark

For more information, check out the entry on Know Your Meme! #deltarun

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I'm saving this again because o needed it once but I couldn't find it

Meta-meme, Meta (Slang)

Meta (Slang) Know Your Meme

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Meta, Meta (Slang)