when a girl has facial hair above her upper lip
yo that chicks mac nasty had more hair than my mustache
af kazzilla 20. marts 2010
2 more definitions
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.
af Jason Yard 12. august 2006