A game in which three males ejaculate into separate cups, and three females have to randomly choose a cup and turkey-baster it into their vagina. 9 months later, the females have to guess which male spawned their newborn child.
"Hey Kerri! How about you and Jasmine and Bella join John and Kyle and I for a game of Mystery Son this afternoon!"
"Sounds like a plan! Hope I get you!"
by FanOfGenitals May 25, 2012
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When a lesbian is chatting to a cute girl who drops the bombshell that she has a boyfriend and are you interested.

No detail of who he is, what he's like.

He is mystery meat
You know I said I matched with a cute girl on tinder? She only went and tried to sell me her mystery meat
by SavvyOne November 9, 2018
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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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