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15.
A horrible and disgusting form of diarrea that fills the whole toilet with its volume and the whole house with its odor; is usually due to consumption of fast food or drinking lots of alcohol the night before.
"Dude, why are you clutching your stomach with one hand and covering your ass with the other?"

"Fuck, I knew I shouldn't have mixed rum with pabst with gin with taco bell with a big mac last night, now I have to take the biggest McNasty known to man."
por Danny Sin 15 de Abril de 2007
17 18
 
16.
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
por Josh Chotta 17 de Janeiro de 2007
3 4
 
17.
something that is so unbelievable, that its better than awesome
Thats so mcnasty!, Aaron won the lottery.
por The Real Pab 23 de Junho de 2006
4 5
 
18.
A female that has taken disgust and grime to an extremity, a true whore at heart that reminds every man of something that can be purchased at mcdonalds; fat, sloppy, and down right disgusting. Generally, if you are indeed dealing with a true McNasty on your hands, chances are that she is so loose that a football can get inserted with zero difficulty.
Guy 1: Wow bro, every time I turn around that girl is hooking up with a new guy. I can't believe you got with her!

Guy 2: I know dude! Chances are I might have an STD...Im pissed.

Guy 1: Yeah dude I'd get checked out tomorrow, what a god damn McNasty
por President of Piffboro 05 de Junho de 2011
4 6
 
19.
Ordering a McDouble and a McChicken, then putting both patties between one set of buns, to create one nasty sandwich.
After the bar last night, I went and got a McNasty and 10 piece McNuggets.
por sirpilf 14 de Março de 2010
2 4
 
20.
Too be excetionally nasty, grimy, or just down right dirty.
Joe has a very McNasty swag.
por swagmarket 29 de Outubro de 2009
12 14
 
21.
When a guy nails a chick in the ass and then she sucks his cock.
Guy 1: Dude, did you really give her a McNasty?

Guy 2: Hell yeah!
por dafrog_05 16 de Março de 2009
3 5