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
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A twin who is really, a dumb bitch.
generally annoying.

Also, pumpkin shaped with toothpick legs.
I like maggie, but mary-kate is a dumb skank. What the hell is up with her damn dash anyway?

WOW! She is very pumpkin shaped...she's a Mary-Kate!
by curtisssss June 13, 2008
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Verb: to induce vomiting when feeling bloated and particularly regretful after bingeing
The party is tomorrow! She's gonna have to "mary kate" that Big Mac if she wants to fit in her dress.
by Richard F the2nd December 28, 2007
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mary-kate; a girl who wont give up her eating disorder. and is afraid of getting help, who wont accept the help she needs.
mary-kate; i am afraid to be over ninety pounds,im not going to keep my food down.
by naghmeh November 23, 2007
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noun; a girl who wont give up her eating disorder. and wont accept the help she needs.
mary-kate; i am scared to get fat im just not going to eat.
by naghmeh November 23, 2007
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mary-Kate; a girl who wont give up her eating disorder, a girl who is afraid of getting fat, and wont accept the help she needs.
mary-kate; i am scared to get fat so i just wont eat and if i do ill throw it up.
by tokieo November 24, 2007
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