When someone has sex in a McDonalds restroom.
Rick- Chad did you have a Mc Nasty yesterday?
Chad- Yeah right after my Big Mac.
by a keyboard December 2, 2009
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Very "attractive" girls of a certain age that go through a phase when sexually attracted to Vin D

A girl that is blindly looking for any guy of any type to attach themselves to.
Holy shit, look at all Vin D's Mc Nasties!

Wow, someone help Vin D! He's being swarmed by his Mc Nasties!

And the legendary one.
Vin D stop texting your fucking Mc Nasties!
by Herman Andy Jimmy Chris January 31, 2008
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Having nasty hot sex anywhere but the bed
Guy 1: Hey why are those people doing it on the ground?

Guy 2: They must be doing the rasta-mc-nasty
by SOL-DUDE July 29, 2011
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Sick Mc Nasty is a term used to describe great moves in a sport, such as wrestling.
mike: Hey, dude, that move was soo sick mc nasty!

robbie: thanks dude!
by secret crest August 9, 2009
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Used to describe something cool or awesome that happened, or will happen
Bro1:That was a great concert
Bro2: Yeah dude it was Sick Mc Nasty


Girl1:Are you going to the party tonight
Girl2: Yes i am, i hear that its going to be Sick Mc Nasty!
by The Haterader April 29, 2009
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A females/women gentiles being super nasty, but some what edible.
Yuck tyrone you have some hair in your gums did you eat tashas mc nasty cunt.
by Cum gums August 6, 2017
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