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18.
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
dodane przez President of Piffboro czerwiec 05, 2011
 
1.
McDonald's. The grossest restaurant chain on the planet.
I'll never eat at McNasty's again. Their hamburgers and breakfast stuff have the same gross-ass taste, and the fries are so damned greasy you can almost wring them out. I remember the first time I had a McRib sandwich; it was also the last time. I puked that up that sucker in the parking lot. Beats the hell out of me how they can sell anything anymore. You couldn't pay me enough to get supersized on that tripe they serve.
dodane przez Warpig9761 czerwiec 15, 2006
 
2.
A McNasty is a delicious combination of a McChicken and a McDouble. To make a McNasty, order a McChicken and a McDouble, take the top bun off the McDouble and the bottom bun off the McChicken. Place the McChicken on top of the McDouble and enjoy!
"What are you going to get from McDonalds?" "I can't decide between a McDouble and a McChicken, I think I'm going to have to go with a McNasty."
dodane przez crazybeaver marzec 12, 2009
 
3.
when a girl does the dirty with you at mccdonalds
AWW man you see that? She just gave me a mcnasty!
dodane przez HAUSBABY! kwiecień 24, 2009
 
4.
Something extremely awesome and/or unbelievable
Did you see that stunt? That was McNasty!
dodane przez J-Fort marzec 23, 2006
 
5.
When someone has sex in a McDonalds restroom.
Rick- Chad did you have a Mc Nasty yesterday?
Chad- Yeah right after my Big Mac.
dodane przez a keyboard grudzień 02, 2009
 
6.
Two McDoubles surrounding a McChicken. estimated around 10,000 cal. thats about 5 days worth of calories but its 100% greasy goodness. Also called the McGangbang because it looks like two black patties surrounding a white one
Bro 1:Dude im starvin'
Bro 2: Lets go to Micky D's
Bro 1: Im totally getting a Mcnasty!!
Bro 2: Dude you're sick!
dodane przez Mark Brenner luty 15, 2012
 
7.
Something so disgusting that it challenges the nastiness of any food originating from McDonalds, whether it be actual food or just something really gross.
1. Peanut butter and tuna sandwiches are Mcnasty.
dodane przez Candy Richman czerwiec 01, 2004