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.
โดย Kalaniiii 29 มิถุนายน 2006
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.
โดย Warpig9761 15 มิถุนายน 2006
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."
โดย crazybeaver 12 มีนาคม 2009
when a girl does the dirty with you at mccdonalds
AWW man you see that? She just gave me a mcnasty!
โดย HAUSBABY! 24 เมษายน 2009
Something extremely awesome and/or unbelievable
Did you see that stunt? That was McNasty!
โดย J-Fort 23 มีนาคม 2006
When someone has sex in a McDonalds restroom.
Rick- Chad did you have a Mc Nasty yesterday?
Chad- Yeah right after my Big Mac.
โดย a keyboard 02 ธันวาคม 2009
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!
โดย Mark Brenner 15 กุมภาพันธ์ 2012
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.
โดย Candy Richman 01 มิถุนายน 2004

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