When several guys ejaculate into a bowl and mix it up. The semen mixture is poured into the vagina.

When the baby is born, a test is taken to see who is the father. Whoever is the father fins.
Mystery Bukkake rules
by Master June 26, 2004
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Recieving an envelope in the mail that has no return address, and includes dog feces, male ejaculate, and a Sam Bowie rookie card.
I wonder if it was Heath that sent my that mysterious mitchell on my birthday.
by Don Everest April 5, 2005
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When given the choice between getting something of known value or something of unkown random value, the latter is denoted by the mystery box.

It might be fine to go for the mystery box. But human beings have a tendency to fall for the mystery box without weighing the outcomes first, seeking the thrill of gambling.
A boat is a boat, but the mystery box could be anything! It could even be a boat! And you know how much we want one of those. We'll take the box.

Who could resist the call of the mystery box.
by evilm0nkey June 14, 2017
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boners that seem to come from nowhere, and for no reason. Can tend to be embarassing, and can often lead to extremely humorous moments.
One guy: Dude ive been getting alot of mystery wood lately.
Other guy: What the fuck is mystery wood?
Guy grabing a hold of his boner: THIS!
Other guy:WHAT THE FUCK MAN!
Guy with boner: Exactly theres no reason for this, why did it show up, well never know.
by Themi Theodos May 9, 2009
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A team of "secret agents" who belong to mysterymissions.com and the facebook group. Agents have agent names and are told to go on "missions" via facebook, email, and text.
A Mystery Mission would appear like this:

"Mission: Stick post-it notes around your neighborhood that make people happy."
by Agent hELLfIrE December 6, 2009
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A site that is like Google, only when you type in what you want to search for it shows results of the person who searched last, and vice versa.

You can also 'search' up your own message and hope it reaches to someone.
*types in 'cat' in mystery google search box*
*actual google results show cheese*
-in another place in the world-
*typed in cheese in mystery google search box*
*actual google results show cat*
by Video Gamer November 9, 2009
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Cum, jizz, semen, etc. etc
I just ate a white air head and it reminded me of your white mystery
by Dean from Champaign April 10, 2007
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