a reference to a human being that stuffs their fat into a pants size way too small so that their hairy ass crack hangs out.
also a word to describe something very discusting, or to complain.
'Escuse me sir, I'd like to speak with the McManager about these MCNASTY french fries. I'm very unmcsatisfied with their utter mcnastiness.'

'WHOA DUDE! look at that heffer's ass! it's so effin mcnasty. it's a full moon tonight, ehh?'
by the mcmanager November 07, 2008

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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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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 03, 2009

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-noun, overweight, ugly, disgusting McDonald's worker who you fuck; someone who nobody but YOU would have sex with
1. Dude, the drive-through lady is disgusting... That's a McNasty!

His first time was a McNasty, sucks to be him!
by MBA-BJS December 21, 2009

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Too be excetionally nasty, grimy, or just down right dirty.
Joe has a very McNasty swag.
by swagmarket October 29, 2009

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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 30, 2009

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1.something really gross or completely disgusting,
dood:i went to the bathroom and someone had sharted all over the seat, i don't think he made it!

Dood2:AWW bro! that is so McNasty
by k_u August 15, 2008

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