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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(slang) Typically used when talking about Psychedelic Mushrooms hitting really hard, or either looking to take a strong trip on Mushrooms.
Friend 1: "Last night we were everything everywhere!"

Friend 2: "Dayum broski we were certainly on another quest for the Mysterious Oysters!"
by 13AquaOrbit January 26, 2023
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Mysterious hole is a place you should never visit, never say this word unless you are wanting to be lonely. Just like Lewis please reader learn from his mistake, don't be a Lewis be a Ethan.
Have you ever used a sex toy aka should something up the mysterious hole
by MilkshakeMan30 October 20, 2021
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Is it though? Is it “mysterious?” It is it just fat cock? My money is on fat cock.
Hym “I wouldn’t call it it ‘mysterious.’ I would call it ‘Goliath.’ Or ‘Fuckasaurus’ I you know? Like ‘Truckasaurus’ except... you know, a penis...”
by Hym Iam November 16, 2022
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