Mcnasty 

when a girl does the dirty with you at mccdonalds

AWW man you see that? She just gave me a mcnasty!

Mcnasty by HAUSBABY! April 24, 2009

McNasty 

Something extremely awesome and/or unbelievable

Did you see that stunt? That was McNasty!

McNasty by J-Fort April 19, 2006

Filthy McNasty 

The perverted old mick in your neighborhood who ogles and fondles all the young girls.

Mummy, mummy! Filthy McNasty touched me on me privates!!!

Filthy McNasty by Booker T. Buttfuck October 2, 2003

Mcnasty 

the doing of sexual intercourse while on the roof of toys r us while giving your partner a texas chili bowl and singing old elvis songs

Cody Houck decided to go on the roof and mcnasty rebel

Mcnasty by Josh Chotta December 13, 2008

Super McNasty 

When a man dips his dick into a jar of Big Mac sauce and has a girl suck on it.

Rodger- What did you do after your shift last night?
Trevor- I stole a some Big Mac sauce and gave Rachel a Super McNasty.

Super McNasty by Wwane Dade February 9, 2012

Filthy McNasty 

Meaning a skanky person. You wouldn't want to touch him/her with someone elses hands.

Hell naw bro, I wouldn't even touch that Filthy McNasty biotch with your dick. She's had everyone's cock up in her [grill}.

Filthy McNasty by SexyGreenEyez February 7, 2005

McNasty 

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.

McNasty by Candy Richman June 1, 2004