McNasty 

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.

McNasty by Miss McNasty September 5, 2008

McNasty 

it's where u have diarrhea, then u shit on a girls/guys chest and then wrap them in plastic wrap.

a guys girlfriend is sleeping and he gives her a McNasty. she wakes up and is covered in shit because she is wrapped up in plastic wrap

McNasty by dzman April 27, 2006

McNasty 

-noun, overweight, ugly, disgusting McDonald's worker who you fuck; someone who nobody but YOU would have sex with

1. Dude, the drive-through lady is disgusting... That's a McNasty!

His first time was a McNasty, sucks to be him!

McNasty by MBA-BJS December 21, 2009

mcnasty 

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.

mcnasty by Kalaniiii June 30, 2006

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 14, 2008

McNasty 

The act of taking two McDouble's, removing the top bun off of one, and the bottom bun off of the otherone, so that there is a 4 patty burger, and putting a McChicken patty between the 4 patties.

"Hey, lets go to McDonald's and make a McNasty"

McNasty by mcnastyofficial April 14, 2017

McNasty 

To boast on social media about defecating while raping someone

“John pulled a mcnasty on linked in and got sentenced to 721 years in prison. He posted pictures and there was so much feces covering both men.”

McNasty by Myguyry December 18, 2018