Mary Kate's are usually beautiful and completely selfless. They are lighthearted but determined, strong, and independent. Mary Kate's are very friendly but can be intimidating because they are so independent. Mary Kate's are usually worldly and wise beyond their years. They have old souls but know how to party and can fit into the different aspects of modern day life. Also, they are physically beautiful and super sexy!

They are very trustworthy and reliable. They put others first always sometimes to the point of forgetting about their own feelings. They have sacrificed a lot but are thankful for all they have. Usually brunettes.
Guy: Who's that brunette over there?
Girl: Oh, her? That's Mary Kate!
Guy: Wow, she's beautiful!
Girl: She only dates foreign men, sorry. And we're best friends so you can't have her.
Guy: You've never even talked to her before.
Girl: I know, but just look at her! She's so radiant, I feel like I know her!
by Roseandrise June 23, 2013
1. A super sexy smart girl who is your bestie she can be atheletic and indepenednt she is fun loving and can be a crazy hooligan - nothing like mary-kate olsen
2. Some one who is like mk olsen, but there really is only one mary kate olsen
by samers101 January 28, 2009
An amazing girl. She's funny and smart, and all around an cool person. She isn't a bitch, but she will make sure that you understand her thoughts on a specific subject. She's athletic, artistic, and a great person to be-friend. I know I'll never want to lose the Mary Kate in my life.
Guy 1: Hey Mary Kate. What's up?

Mary Kate: Not much. I just finished my newest sketch, and now I'm headed to speech and debate.
by Aggressive_ace November 29, 2012
A Mary Kate is a keeper. She will eat all of your food but you well still love her because how big her ass is. She is so sexy and good in bed. Men tend to love Mary Kates. She has a bad side though. She well frecking kill you if you insult her. You better run if she's on a bad mood. She's not mean but she is still very hardcore. Usually Mary Kates pretend to like some people but she hates your guts. If you break a Mary Kates heart she will breck your neck. She is beautiful, hot and funny. Everyone is jealous of Mary Kate because of that.
girl: I wanna be Mary Kate
guy: I wanna be near her
girl: her ass is bigger than my house
guy: bad ass
girl: hardcore af
girl: and hot af
guy: hell yah

God: I created Mary Kate well
by birdsaresexyaf May 14, 2017
a Mary Kate is an energetic, artistic, fun - loving girl. She has a great smile, and a cute body. She's really into music, and has an extremely unique taste. She's a big-time party girl, and is unafraid to experiment... with ANYTHING. Her clothing choices are even more unique than her taste in music, but be careful. a Mary Kate can be a bit of a poser or attention whore at times, but everyone still loves her.
1: What is Mary Kate wearing?

2: Who knows, she probably just picked it out for attention.

1: I don't care, she looks GOOD!
by gthfk8774 December 29, 2011
1) an eating-disorder-ridden, indecisive, eager-to-please perfectionist
2) a sweet, unassuming virgin who is most likely quiet and timid, speaking more with noises (hm, oh, mm) and sound bites (fun, sounds good, whatever you want to do) than actual words, often accompanied by excessive eye-lash batting and pursing of lips. see mary with a twist
3. prude, but with sooo much potential i.e. perfection
1) man you couldn’t decide on what food to order and now you're not eating it.... you going mary kate on me?

2a) i dated some britneys but I'm marrying a mary kate
2b) good luck they are a dying breed....

3a) man, all the girls at this party are whores… wait a second, who’s that hottie?
3b) that’s mary kate. she’s gorgeous, but she’s waiting til marriage.
3a) damn.
by mcluvin8485 March 19, 2009
a "Mary Kate" is an ungrateful spineless bitch that acts alot different in public than she does at home. She happens to be a sweetheart on the outside but a cold hearted bitcg when it comes right down to it. she acts differently around different people and can NOT be trusted.
yeah her parents shouldve just named her mary kate
by angrygirlnnn July 11, 2010