The Collaborative International Dictionary of English v.0.48:

Foppish \Fop"pish\, a.
   Foplike; characteristic of a top in dress or manners; making
   an ostentatious display of gay clothing; affected in manners.

   Syn: Finical; spruce; dandyish. See Finical. --
        Fop"pish*ly, adv. -- Fop"pish*ness, n.
        [1913 Webster]

WordNet (r) 3.0 (2006):

foppish
    adj 1: affecting extreme elegance in dress and manner [syn:
           dandified, dandyish, foppish]