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1.
when a girl has facial hair above her upper lip
yo that chicks mac nasty had more hair than my mustache
von kazzilla 20. März 2010
 
2.
total pimpage
Penelope Cruz is macnasty!
von Sam Nizzle 26. September 2003
 
3.
One who thinks he or she is a tank when drinking (When he or she is not) then they think they are very cool, when there are not. They disrespect women and do not know how to pleasure them because they turn gay and smell funny and they hook up with people from a different race.
Dude stop you have only had three beers your being a Macnasty.
von Jason Yard 12. August 2006