abbreviation for mortal kombat, a kick-ass fighting game.
lady:whatcha gonna do today?
guy:i dunno, probably eat some hard boiled eggs and play some mk.
by knucklehead September 13, 2005
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A great friend who always has your back. Kind,sweet and a little shy a great person whose hair is always on fleeck
Have you met. MK ?

Yeah she is so nice
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Short for Mortal Kombat. The greatest/goriest fighting game series ever!!!
Hey, lets go play some MK!
by JohnC7 August 19, 2005
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Pronounced "em-kay"
Can be used in derivations such as MK-ing, MK-ed

Used colloquially in British Columbia, to describe the action of selling out without good reason. The term is thought to originate from a metro vancouverite named Mark Kim, well known to his community as a martial artist and educated person. This potential origin is backed up by evidence of Mark Kim calling off his attendance to several events for poor excuses such as fatigue or lack of interest.
Scenario #1
Person 1: Hey is Noah coming tonight?
Person 2: Nah man, he MK-ed it.

Scenario #2
Person 1: Dude, I'm tired and I don't feel like going...
Person 2: Kyle! Don't MK it!
by kmj2 October 11, 2010
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Shortened version of marica, which translates gay, but it's used as a slang for :
1.pussy or stupid behavior.
2.incredulity.
3.buddy.
me: Que hace mk? (3)
you: bien huevon, adivine....
me: que?
you: me compre la kawasaki
me: No sea mk!! (2), en serio?
you: pero no sabe la otra....
me: cual?
you: ya la estrelle....
me: QUE MK!! (1), severo idiota.
by joseanbck November 4, 2014
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Mk is the slang used for saying Okay or "you okay" in a question. So say you asked someone to pick up onions, you would say "Pick up some onions, mk?"
You pronounce and say it the way that the M is not pronounced like the alphabet, but the way it would be pronounced in a word, for example the M at the beginning of Megan. The K is pronounced the alphabet way, however, i.e. not in the way you would say "kite". It also can be used to ask someone to do something, as in "Pick up Tommy, mk?" Instead of "Can you pick up Tommy?"
I'm going to the gym, mk?
Pick up Tommy, mk?
Let's go to school, mk?"
by CallMeCorbett April 3, 2011
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