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."
ayon kay Danny Sin ika-15 ng Abril, 2007
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
ayon kay Josh Chotta ika-17 ng Enero, 2007
something that is so unbelievable, that its better than awesome
Thats so mcnasty!, Aaron won the lottery.
ayon kay The Real Pab ika-23 ng Hunyo, 2006
This is when a male picks up a female at a fast food restaurant like MacDonald's. Usually there are other disturbing things involved with the incident.
The other day my friend went to MacDonald's for some post drinking treats and he got a McNASTY to go...hold the fries.
ayon kay Chuck ika-10 ng Hunyo, 2004
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
ayon kay President of Piffboro ika-05 ng Hunyo, 2011
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.
ayon kay sirpilf ika-14 ng Marso, 2010
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
ayon kay Josh Chotta ika-25 ng Pebrero, 2007
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