A very attractive girl, often found at Keg Parties, that all males cannot help but hit on because of her immense beauty. Often is under ridicule from a nearby Dirty Cow who is jealous because that fatty's boyfriend and/or exboyfriend obviously wants the pretty girl. (This riducule never leads to a fight, because the dirty cow is usually taken out by the linebacker in the corner, who assumed the cow was another dude).

"Pretty Girl" -- proper noun -- Cassie

"pretty girl" -- noun -- the sweet scent left on a piece of clothing you've leant to a girl.

To apply her own menstral blood in the form of make-up, in particular on her face, then to dance her around like a marionette singing in a soft tone, "pretty girl, pretty girl, who's a pretty girl?"