Definition

An internet rule stating that if something exists, there's inevitably a Friday Night Funkin' rhythm game mod about it. A testament to both the game's massive modding community and humanity's unstoppable need to make rap battles out of literally everything.

Example Usage

Someone made an FNF mod about my local hardware store—Rule #363 strikes again.

Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=Rule%20%23363&defid=17389053)

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jtlyk

just to let you know...