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26.
1) derived from adding mc onto every word.
2) refers to a boyfriend who has weird habits, crab claws your chest or wont have sex with you even though he has no chance of getting laid.
3) someone who has bad acne and sort of looks like a gremlin because of it
1) The roadkill we just passed is mcnasty.
2) Mcnasty is coming over but we wont DO anything.
3) I got put on this cream because my face was mcnasty.
por Kalaniiii 29 de Junho de 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.
por Warpig9761 15 de Junho de 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."
por crazybeaver 12 de Março de 2009
 
3.
when a girl does the dirty with you at mccdonalds
AWW man you see that? She just gave me a mcnasty!
por HAUSBABY! 24 de Abril de 2009
 
4.
Something extremely awesome and/or unbelievable
Did you see that stunt? That was McNasty!
por J-Fort 23 de Março de 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.
por a keyboard 02 de Dezembro de 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!
por Mark Brenner 15 de Fevereiro de 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.
por Candy Richman 01 de Junho de 2004