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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An abbriviation of the name Mihael Keehl, which is the real name of the character Mello in the anime/manga, Death Note.
Person 1: DUDE! MK died in the Death Note episode last week!
Person 2: MK?
Person 1: Mihael Keehl!
Person 2:....Who?
Person 1:...Mello. Retard.
by Mero-cakes July 26, 2008
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nickname for Mary-Kate Olsen. Used by fans and Mary-Kate's friends.
MK's sunglasses are bigger than her head.
by imacarnie July 24, 2005
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A community college in MoCo, MD-Montgomery College

AKA Harvard on the Pike
Tracey: Where does she go to school?
Nicole: MK-not smart enough for UMD.
by amanda December 25, 2003
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A hobbit that leaves feet hair and constantly clogs any toilet by leaving mini dead gerbils.
by high5er April 22, 2010
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Short for marcus
He's a jew
mks is a kid I know. He's jewish.
by Jeff February 21, 2004
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Her parents are Christian missionaries and she grew up in Peru as an MK.
by Hankle June 12, 2006
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