A girl that, while she is sexy and you want to bang, is presumed to be a dirty whore.
Mikey: Holy Shvt! Look at that girl across the bar. I would do things to that girl that are illegal in 48 states!
Tim: You can't be serious dude? I hear that cum dumpster had a train ran on her by 4 guys and gave them all the clap.
Mikey: Good looking out, she's a total Skankalicious McNasty.
by dudubudr March 7, 2011
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The title of Grand Master in Tiger Woods 09....
There can only be one Nasty McNasty and he is Floyd L. McIntyre
by thebaddestmanontheplanet131 January 26, 2009
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A DUMB THICCCCC DEER AND I MEAN IT MAKES YOU GO "DAMN THATS A SHAG MCNASTY"
SO INTHE WOOD YESTERDAY WE SEEN A 4. BUT IN THE WAS THAT GOT DAMN SHAG MCNASTY.
by D-WOP MCNASTY January 29, 2020
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The boss of bitches, thuggest of all, and usually don't fuck with the bullshit. Real name is usually Erin.
Step aside, Thug McNasty is in the room.
by THUG MCNASTY February 11, 2014
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Famous porn star from Santa Clara who pioneered the genre of Trailer Park Porn
Cinnamon McNasty is one of the greatest role models in America of the 21st century
by nuttyDave12 September 27, 2011
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When you are on the verge of taking possibly the most disgustingly smelly, nastiest, painful, room clearing, eye watering, breath shortening, leg falling asleep shit ever...period.

Usually performed at the most inopportune time imaginable:
1) The company picnic where toilet paper is not accessable.
2)Your new girlfriends parents house when meeting them for the first time.
3)While driving the hottest chick home from the bar.
4)At a funeral.
5)At a wedding
6)In church
7)At a sorority house while in the midst of strip poker
8)Before or during a threesome with twins.
9)When cuffed in a police car, or in jail.
10)While attending a sporting event with "open stall" bathrooms.
11)at any store or restaurant without locks on the single throne bathroom.
12)At your inlaws.
A shat mcnasty is the shat of all shats, the dump of all dumps, the king of all craps, the morning after eating at any mexican taco stand.
Dude: "what happened last night after I had to leave?"

Dude 2: "the Olsen twins lost their hand in strip poker and got naked looking for you....where did you go?"

Dude: "after eating all that mexican food and drinking that pisswater they call beer, I went to the ihop and took a shat mcnasty. I blew it out in there and cleared the place, I think they called the fire department."

Dude 2: "did you go home and shower after that?"

Dude: "I had to"
by rileyriley April 29, 2010
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