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Rule 63

(internet slang, fandom slang, informal) The proposition that it is possible to find genderswapped versions of every fictional character, especially as fan art on the internet.

Documented since 2000s2000sGen Z61 viewsLast reviewed Jun 29, 2026+ Add a definition
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Born ~2007 · no dated citations yet
2007BornToday, 2026
Late-Millennial / Web 2.0 eraSee decade cohort →

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#1·Apr 26, 2026

(internet slang, fandom slang, informal) The proposition that it is possible to find genderswapped versions of every fictional character, especially as fan art on the internet.

Origin: Rule 63 was first introduced as part of the expanded edition of Anonymous’ Rules of the Internet, most likely published in the summer of 2007, based on Google Insights. The Urban Dictionary entry for “Rule 63” was first submitted by user InternetHateMachine on August 8th, 2007. Origin information sourced from Wiktionary contributors (CC BY-SA 4.0).
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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.

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