Mysterious brown: something brown on your skin or clothing that could be chocolate from a previously eaten snack or it could be dirt, or it could be shit. You can't be sure that it is chocolate or you could lick it off, so you have to clean it.
Oh no, I just ate a kit kat bar and then pet the dog and now I found something brown on my arm. That is some mysterious brown. I'd better wash it off with soap and water.
by DebbyHM December 9, 2018

Musical duo comprised of Ricci Lahn and Zach Butler with mind blowing guitar sounds and unequaled sex appeal.
Woman #1: Oh my God girl, did you see Mysterious Clitoris last night at the bar?
Woman #2: Yes I did! Girl, my panties are still wet.
Woman #2: Yes I did! Girl, my panties are still wet.
by Reltubhcaz1977 June 23, 2020

1) The art of being the person that everyone in the party notices, but no one at the party seems to know.
2) The girlfriend or boyfriend your friend has, but never divulges any concrete information about.
3) The person that is inherently a contradiction.
2) The girlfriend or boyfriend your friend has, but never divulges any concrete information about.
3) The person that is inherently a contradiction.
1) Guy 1: You man who's that slampiece milkin' the keg right now?
Doorman: No clue son. I've never seen her on campus,I don't even remember stampin' her. Leave her alone though, shes good for the party.
Guy 1: Straight Mystery...
2) Rabbit: Yo Coon what was does your girlfriend look like again?
The Coon: She's about 5'0" - 5'7". She's cute. She has nice hair, pretty eyes, good lips.
Rabbit: Straight Mystery...
3) Guy 1: Yo that Rob guy is a Straight Mystery bro. Like he's always at the party, he never comes to class, but he always gets the highest exam score.
Doorman: No clue son. I've never seen her on campus,I don't even remember stampin' her. Leave her alone though, shes good for the party.
Guy 1: Straight Mystery...
2) Rabbit: Yo Coon what was does your girlfriend look like again?
The Coon: She's about 5'0" - 5'7". She's cute. She has nice hair, pretty eyes, good lips.
Rabbit: Straight Mystery...
3) Guy 1: Yo that Rob guy is a Straight Mystery bro. Like he's always at the party, he never comes to class, but he always gets the highest exam score.
by Swagstar69 May 12, 2011

by Holiday Guy December 19, 2019

by HookTheGamer December 22, 2017

Blood that suddenly appears for no immediately obvious reason, such as accidentally scratching an itch and you hand comes back with blood on it.
"I just scratched the back of my head and now I've got mystery blood on my hand, can you check back there?"
by taerg_eht_oznobroc November 25, 2020

The process when you're practicing a skill relentlessly but continuously fail to master it, but when trying again after a certain number of days, the skill comes naturally>
Zoe simply could not understand how she was able to play the piece correctly. The night before, her pathetic attempts to master bars 57 -79 held no results no matter how she practiced it, Today, however, she was able to perfectly play the piece on her first attempt. It seems that her playing skills had undergone a mystery marination overnight.
by Chamber August 1, 2018
