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?'
بواسطة the mcmanager نوفمبر 7, 2008
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
بواسطة Greys anatomy Fan اكتوبر 29, 2011
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
بواسطة Bakken مارس 3, 2009
-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!
بواسطة MBA-BJS ديسمبر 21, 2009
Too be excetionally nasty, grimy, or just down right dirty.
Joe has a very McNasty swag.
بواسطة swagmarket اكتوبر 29, 2009
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.
بواسطة JeffReedsGirlx3 يناير 30, 2009
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
بواسطة k_u اغسطس 15, 2008

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