Unus Annus is latin for ”One Year” and was the name of the now deleted channel made by Mark Fischbach (Markiplier) and Ethan Nestor (Crankgameplays). I also grew emotionally attached to it.

Memento mori my friends.
Mark and Ethan-Memento mori, Unus Annus.
by SwedishYoungGlucoseGuardian November 24, 2020
Get the Unus Annus mug.
"Unus Annus" (lat. = One Year) was a one year project made by Crankgameplays, as Unus, and Markiplier, as Annus.

The point of Unus Annus was to make memories, enjoying the moment you had and in the end, remember death. (Also worth noting: Memento Mori = Remember Death)

They would upload a video every single day for one year ans delete the whole channel, after the clock stopped ticking.
A: Hey did you watch Unus Annus?

B: Yeah I did! It was so cool! My favourite video was Pee Sauna!

A: Oh yeah that was a good one! I liked "Mark knows what Ethan did" the most tho. Oh by the way, are you an Unus or an Annus?

B: Oh, I'm an Unus. And you?

A: I'm Norbert actually.

(Norbert Mooses was a fusion of Mark and Ethan)
by Vaniffective November 3, 2020
Get the Unus Annus mug.
One year in Latin, also name of a youtube channel that will be deleted in one day. Latina est stultus. Also if you put that into google translate, for some reason it says "English is stupid" when it actually means "Latin is stupid".
Markiplier and CrankGameplays made a channel called Unus Annus, that is probably already deleted.
by Jon Jacob Jingleheimer Schmit November 11, 2020
Get the Unus Annus mug.
Used when something is very upsetting or if someone mentions Unus Annus when you're vibing.
I was vibing to the different iconic YouTuber outros until I was unus annused.
by itsyourboidetza December 10, 2020
Get the unus annused mug.
Unus Annus means one year in Latin. Unus Annus was also a YouTube channel created by Markiplier and CrankGameplays. That channel was only up for a year. Throughout the year they did stupid stuff together and they made a lot of people happy. Once that year was up though, they deleted everything of that channel. If you are a future generation reading this I am sorry you didn't get to experience or even know the channel Unus Annus. They made the channel in 2019 and ended it in 2020.

Memento Mori
“Man.. Do you remember Unus Annus? And when Mark taught Eef how to read?”
by Marshmallow Glitch December 15, 2020
Get the Unus Annus mug.
Latin for One Year.
Also a YouTube channel that deletes itself after a year.
Often used with Momento Mori, Latin for Remember Death.
Some commenter: Imagine if Unus Annus is actually made in 1985. Memento Mori
Internet Troll: Dude what is Unus Annus, I've never heard of that before
by FishlandicFishy December 27, 2021
Get the Unus Annus mug.