Too be excetionally nasty, grimy, or just down right dirty.
Joe has a very McNasty swag.
by swagmarket October 30, 2009
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A burger from a guy in the McDonalds parking lot that has a load of cum on the meat
What the Fuck, he gave me a McNasty
by Bakken March 3, 2009
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Someone Who Does it with your ex.. you think shes ugly but shes really pretty but just a rebound girl
Christina-OHH he did it with Mcnasty
Meredith- Yup
by Greys anatomy Fan October 29, 2011
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when you force feed someone a big mac while raping them
he mcnastyed that trick ass bitch
by Lemony Petaphile June 3, 2008
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a nasty person that works at mcdonalds & god knows what they put in your food.
I went to mcdonalds last night & McNasty was working the window.
by JeffReedsGirlx3 January 31, 2009
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A female that has taken disgust and grime to an extremity, a true whore at heart that reminds every man of something that can be purchased at mcdonalds; fat, sloppy, and down right disgusting. Generally, if you are indeed dealing with a true McNasty on your hands, chances are that she is so loose that a football can get inserted with zero difficulty.
Guy 1: Wow bro, every time I turn around that girl is hooking up with a new guy. I can't believe you got with her!

Guy 2: I know dude! Chances are I might have an STD...Im pissed.

Guy 1: Yeah dude I'd get checked out tomorrow, what a god damn McNasty
by President of Piffboro June 6, 2011
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