Mysterious dragon

When you catch an STD without having engaged in any sexual activity.

Incel: How did I get this rash? This is f**ked.
Dude: Beware the mysterious dragon.

by CocoPapa November 11, 2025

Mystery Mudding

The act fornicating (male on female) by which taking the lovely lady from behind, once finished, you pull your fleshy meat stick out and to your surprise, it is covered in fecal residue. It is at this point you realize your error.

Oh boy, I was so drunk last night, I hammered Beatrice from behind, only to later figure out I had gone Mystery Mudding.

by JBCB March 9, 2024

The Mystery Pond

Any depth of undentifable liquid

Ahhhhh the mystery pond

by Hedonia January 22, 2024

mystery mutt

a mixed breed dog of unknown breed origin.

a dog that resembles many different breeds.

my dog looks like she could be a shepard/jack russell/sheltie or a whippet/collie/border collie or a corgi/shepard/whippet or a smooth collie/jack russell....she's a mystery mutt.

by Lisavi April 6, 2008

Mystery liquid

something you should never. EVER. drink. If you drink it, you will probably die.

guy 1: don't drink that mystery liquid!
guy 2: I wasn't gonna, retard.

by SailorJazzy<3 September 20, 2023

mystery shit

A shit that comes out so fast, you can't decide if it's liquid or solid.

I took a mystery shit last night.

by icouldntthinkofanyothername November 13, 2011

Mystery machine

The van that has a nice man who looks like Santa clause offering you candy

Santa: hey, look it’s the mystery machine, do you want to see Scooby-Doo

by Norville Rogers April 23, 2020