McNasty 

An extremely rancid, bloated, overweight and unkempt person--especially one who has the odor of decayed feces even after exhaustive bathing.

Scott is such a McNasty I doubt he will get hired after his time is up!

McNasty by godde$$ April 29, 2005

McNasty 

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.

McNasty by Chuck June 10, 2004

mcnasty 

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?'

mcnasty by the mcmanager March 25, 2009

McNasty 

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

McNasty by k_u October 9, 2008

McNasty 

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."

McNasty by Danny Sin April 22, 2007

McNasty 

Too be excetionally nasty, grimy, or just down right dirty.

Joe has a very McNasty swag.

McNasty by swagmarket October 30, 2009

McNasty 

A burger from a guy in the McDonalds parking lot that has a load of cum on the meat

What the Fuck, he gave me a McNasty

McNasty by Bakken March 3, 2009