Latin for 'One Year'.
This YouTube channel was founded on November 15, 2019 by Mark Fischbach (Markiplier) and Ethan Nestor (Crankgameplays). They post one video every day for 365 days. After that time is up the channel along with all its videos will be deleted.

Me: Did you see Unus Annus's new video?
Friend: Yeah, Mark really is a masochist.

Unus Annus by _Magikarp_ August 11, 2020

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Unus Annus

1. Latin meaning "One Year" and the name of a channel created by Mark E. Fishbach (Markiplier) and Ethan Nestor "CrankGameplays" that will be deleted after one year of its first upload.

2. A channel. An excuse for Mark to display his masochism

Subscribe to "Unus Annus". Memento Mori

Unus Annus by SS_Derp May 11, 2020

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Unus Annus

A channel run by Ethan Eef Nestor and Mark Masochist Fishcbach, They started it on November 15th, 2019. Its about death, basically. They ocasianally tell people that the end is coming ever closer- But most of the time they just let things go wild for sh**s and giggles.

Some dude: hey whats that that one Unus Annus episode?
Another Dude: The one were they play children's games in the dark?
Some dude: Thats the one

Unus Annus by ZeeXtor August 26, 2020

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Unus Annus Day

The one day out of the entire year on november 13 where fellow unus annus fans go out and wear merch and celebrate all the life lessons that Mark and Ethan have taught us.

Bro make sure to wear your merch tomorrow for unus annus day

I wouldn't miss it for the world man

Unus Annus Day by The clock is ticking November 5, 2020

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