The Collaborative International Dictionary of English v.0.48:

Snobby \Snob"by\ (sn[o^]b"b[y^]), a.
   Snobbish. [R.] --E. B. Ramsay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

snobby
    adj 1: befitting or characteristic of those who incline to
           social exclusiveness and who rebuff the advances of
           people considered inferior [syn: clannish, cliquish,
           clubby, snobbish, snobby]