1. (noun) A whore who considers themselves "classy", with a high tendency to only shop at Anthropologie, where the high priced clothes there validates their whore-like actions and gives the illusions of being "classy".
2. (Verb) To be fixated on another person in a sexual manner, Involves intense onesided flirting, and ultimate obsession over a particular human involving the memorization of license plates, home address, phone number, and/or social security.
Guy: Jesus Christ you're such a whore.
Girl: Excuse yourself, This dress is from Anthropologie... I'm the classiest MackNasty you'll ever hook-up with.
Girl A: I Think me and(Person)are like destined to be together, I know everything about him! I better call, his car is going to need an oil change on the 13th.
Girl B: Well, I think you are totally MackNasting the hell of him, Stalker. You should seek professional help.