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