When you aren't sure how big/small a guy's dick is
My new boyfriend really has a mystery meat.
by Samiejo816 November 18, 2016
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Mystery Unknown One, it's a term used for people disguised as an unknown one, and are a mystery for people. It's also used to tag people who never talk about their selves. It's also a name for a Tf2 Server Community's Admin; The name of the community is AoDRP, he gets bullied by spamming Tatsumaki's Rep commands.
???: *walks through the city*
People: Oh, he is mysterious.....
Dick Skinner: Nah he is just Mystery, an AoDRP Admin. His name is Mystery Unknown One, a good admin tbh.
by JustFabby May 12, 2018
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When you go to the bathroom with the lights turned of and just hope you're pissing in the toilet
Dude i just want to the bathroom and mystery pissed all over the bathroom
by Tractor Tom December 21, 2017
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When your teacher assigns an assignment on google classroom without a due date, so it doesn't appear on the homepage
Teacher: Did everyone do the assignment I posted yesterday?
Kid: What assignment?
Teacher: Click on our google classroom page
Kid: Oh, you assigned a Mystery Assignment!
by hi1923 October 17, 2022
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The random spluge-stain you see under a UV light (generally on a motel bed).
Brendan: "We stayed at the cheapest motel; it had a mystery swirl on the bed!"
by afaraci12099 August 17, 2016
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someone thinks mystery is something scary, but it wasn't! mystery is something that is secretly and no one knows.

if nobody knows about anything, they call it a ' mystery
- it's a mystery that no one knows about the treasure
-that man is mystery, i hope he didn't like me!
by braxtonprodex June 17, 2021
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