To vomit profusely or to make yourself vomit. A direct referance to Mary-Kate Olsen's eating disorder.
"That chinese food got the best of me. I might have to go mary-kate that shit up, here in a minute."
by Amy Christ April 29, 2005
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to force one's self to puke as in fashion with the olsen twin
i had so much pizza i had to pull a mary-kate, no dumbass i didn't take it up the ass, i puked.
by the February 16, 2005
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a girl i am in love with even though i'm a straight girl.

mary-kate olsen is the prettiest girl alive.
"that girl is a mary-kate"
by Lindsay March 24, 2005
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While I was sitting on my couch, I ate a 3 day-old moldy hot dog and immediately mary-kated all over the coffee table.
by Justin Koehler February 16, 2005
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we love you mk! wanna do some lines later?
by jjwinaba March 31, 2005
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one who loves hard-core make out sessions with small Asian men. likes to lick ones balls while having cum spurted at her face. always up for a good time, but most always is part of the bad times. bushy eyebrowed, narrow minded, snout faced homosexual. not one to talk to in public. ralated to a species of jack ass, usually mates with them in the spring.
Hey were you talking to a mari-kate yesterday at the mall?

What?!?! Of course not. eww.
by Bossin September 18, 2008
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