Definition
An unofficial November 14th commemoration of the YouTube channel Unus Annus, which Markiplier and CrankGamePlays deliberately deleted after exactly one year to make a point about mortality and impermanence. Fans celebrate by wearing black and white or channel merch, essentially throwing a birthday party for something that's dead. It's philosophy meets internet culture in the most Gen Z way possible.
Example Usage
I'm wearing all black tomorrow for National Unus Annus Day—memento mori and all that.
Source: Urban Dictionary (https://www.urbandictionary.com/define.php?term=National%20Unus%20Annus%20Day&defid=15487914)
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