The act of dressing up to receive attention. This is derived from the term Peacocking. This is when people dress up to recieve attention from possible mates, like how male peacocks display their feathers.
Possible feathers are bracelets, belts, hats, necklaces, and anything out of the ordinary.
Paul: Are we going out tonight?
Nick: Yeah man, feather up! We are going to that new bar on Thayer Street.