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 25, 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 23, 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 24, 2003
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Jesus where do i start? mk is perfect. she's amazing. gorgeous. forgiving. loving. and the best friend you could ask for. she might be shy and timid when u meet her but when u get close to her she is basically the best thing to have in your life. keep her close and tell her you love her because she may seem bright and bubbly but she also has her fair share of battle scars. she makes u laugh and smile whenever your with her. and i'm so lucky she's my best friend.
by Sown August 19, 2017
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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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a shortened version of mike kachowski
how do you get added into the mk groupchat on twitter?

you have to be iconic
by @mikekachowski November 05, 2016
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