Mystery spot

When you leave unknown juices on someone else's couch, and nobody knows what the substance is.

Man, I mystery spotted last year and people STILL be makin' fun of me!

by Snicklitter69 July 2, 2019

mysterious

ovia

you are not mysterious

by olivia_longbottom May 1, 2023

Mystery Son

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 November 5, 2012

mystery piss

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 April 21, 2018

mystery box

A collection of items, usually linked by brand or product type. They became popular since the 2010s.

Although they can be bought online, it is very easy to make a mystery box that contains items you have bought and sent it to someone.

My friend sent me a mystery box that contained Nike sneakers - Someone getting a mystery box of expensive shoes

by Ryan900USAYT August 27, 2023

Mystery swirl

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

Mysterious

Something that is hard or impossible to understand

That man over there is very mysterious

by Da🤡 July 24, 2021