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27.
Usually a pretty girl, but also tends to be visably crazy. Usually spotted in North Beach; does not F*&@ with roofies as they are real and not a joke.
She is a real live person, that McNasty.
von Miss McNasty 13. Juli 2006
 
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.
von Warpig9761 15. Juni 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."
von crazybeaver 12. März 2009
 
3.
when a girl does the dirty with you at mccdonalds
AWW man you see that? She just gave me a mcnasty!
von HAUSBABY! 24. April 2009
 
4.
Something extremely awesome and/or unbelievable
Did you see that stunt? That was McNasty!
von J-Fort 23. März 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.
von a keyboard 2. Dezember 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!
von Mark Brenner 15. Februar 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.
von Candy Richman 1. Juni 2004