8
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.
by Chuck June 10, 2004
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Golden Shower Plush

He's warmer than you think.

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9
1.something really gross or completely disgusting,
dood:i went to the bathroom and someone had sharted all over the seat, i don't think he made it!

Dood2:AWW bro! that is so McNasty
by k_u August 15, 2008
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Donkey Punch Plush

10" high plush doll.

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10
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!
by Mark Brenner February 15, 2012
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Dirty Sanchez Plush

It does not matter how you do it. It's a Fecal Mustache.

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11
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."
by Danny Sin April 15, 2007
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Cleveland Steamer Plush

The vengeful act of crapping on a lover's chest while they sleep.

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12
Too be excetionally nasty, grimy, or just down right dirty.
Joe has a very McNasty swag.
by swagmarket October 29, 2009
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Golden Shower Plush

He's warmer than you think.

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13
when you force feed someone a big mac while raping them
he mcnastyed that trick ass bitch
by Lemony Petaphile June 02, 2008
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Donkey Punch Plush

10" high plush doll.

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14
a reference to a human being that stuffs their fat into a pants size way too small so that their hairy ass crack hangs out.
also a word to describe something very discusting, or to complain.
'Escuse me sir, I'd like to speak with the McManager about these MCNASTY french fries. I'm very unmcsatisfied with their utter mcnastiness.'

'WHOA DUDE! look at that heffer's ass! it's so effin mcnasty. it's a full moon tonight, ehh?'
by the mcmanager November 07, 2008
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Donkey Punch Plush

10" high plush doll.

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