fluid that is unknown or unrecognizable, may be concerning towards one who discovers such a fluid.
dude, i just found some mystery fluids coming out of my hole.
thats concerning.
A shit that comes out so fast, you can't decide if it's liquid or solid.
I took a mystery shit last night.
When some unexpectedly kind of liquid sprinkles on your head/body, and you have to touch it with your hand and look at it to identify the liquid. This usually happens when it's not raining or when you're inside. The build-up to the reveal is always intense, yet 9/10 times it's still water. You always think it's birdshit or some kind of bodily fluid.
"I walked beneath a tree yesterday and got a mystery sprinkle. I thought it was birdshit but it turned out to be just water."
Finding an unknown object and t-bagging it.
Tim: What's that?
David: I don't know
Tim: *T-bags it*
David: MYSTERY T-BAG!!!
(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!"
The best Pokemon spinoff series, even surpassing the mainline games, at least as of now.
Person 1: Pokémon Mystery Dungeon made me cry
Person 2: bitch no it made you a furry