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Mr. X is the male version of the letter "X" in the English alphabet. Mrs. or Ms. X is the female version. Since they have no genitalia it is hard to differentiate between the two.
abcdefghijklmnopqrstuvwxy and z - Mr X is right in there towards the end.
Mr X by Junkrocka May 15, 2008
mister X is a person that you talk about with friends in code, usually a dealer of things that are code-worthy. See Mr. Nice Guy.
Are you going to mr x's? To get that stuff? Cool.
mr x by mogrove42 July 22, 2006
Bernie the Farmer from the Shaun the Sheep movie but he lost his memory and calls himself Mr X.

He becomes a fully HECTIC flemmo barber who gives people fresh fades!
Guy 1: Yo I'm about to watch the Shaun the Sheep Movie
Guy 2: Can I come?

*After watching the movie*:

Guy 1 & 2: OMG Mr X is FULLY SICK he's DA GOAT FRFRFRF ONG NO CAP I WANT A FRESH FADE FROM HIM RN W MOVIE
Mr X by goofy ahh skibidi ohio rizz October 30, 2023

Mr X Cock Size 

Damn Mr X Has A Big Ass 19 Inch Cock
Mr X Cock Size Is Huge
Mr X Cock Size by Mr X X X March 3, 2023

Smithers x Mr. Burns 

A ship involving Smithers and Mr. Burns from The Simpsons.
Dude! Smithers x Mr. Burns should become canon!

Mr Mann X Desi 

My otp
Daku: What's your server otps?
Me: Mr Mann X Desi
Mr Mann X Desi by DGETSDTHHGS March 23, 2020
More from Urban Dictionary
A girl who does ballet and only talks about ballet. Her schedule is filled with dance classes which does not allow her to do any other activity.
"Hey, do you know that girl Sally?"

"Yeah, she's kind of annoying. All she ever talks about it ballet."

"Wow, what a Bunhead."

"Hey Sally, you want to hang out this weekend?"
"I can't, I have dance."
"You're such a Bunhead."

"Yeah... I know."
Bunhead by Jen00 October 24, 2014
Word of the Day on October 6, 2026

trucker's tan 

A sunburn or suntan focused on the left arm. It is caused by the left side of the body being the only half that gets exposed to sunlight while driving. Presumably, it would be located on the right side of the body in countries where they drive on the left side of the road.
I had a trucker's tan after driving for 10 straight hours on a sunny day.
Word of the Day on October 5, 2026
The phenomenon where adults salivate at children's toys
Every time I walk into the toy aisle, I catch myself kidulting over the latest action figures and LEGO sets!
kidulting by Emotional Cruiser October 12, 2025
Word of the Day on October 4, 2026
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