Top Definition
A secretive person that no one knows
Mr x is annoying
by A chicken named jommy May 16, 2016

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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.
by Junkrocka May 15, 2008

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mrx
Short for merci, in the same way that thx is short for thanks, and grx is short for gracias.
TonAmi588: bonjour, whatsup?

PasProb83: hey :) what can I do for u?

TonAmi588: I actually just wanted to ask if u still had ur key, I left mine at home

PasProb83: O yeah come by & u can have it, belle soeur

TonAmi588: mrx!!!

PasProb83: yeah sis no problem
by JustSayin :) July 26, 2011

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Lotsa space for your liquids.

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The Urban Dictionary Mug

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The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

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The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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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.
by mogrove42 July 21, 2006

The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Lotsa space for your liquids.

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The Urban Dictionary Mug

Your favorite word on a white mug.

Create a mug

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug

The Urban Dictionary T-Shirt

Soft and offensive. Just like you.

Buy the t-shirt

The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

Buy the t-shirt