The Collaborative International Dictionary of English v.0.48:

highfalutin \highfalutin\ highfaluting \highfaluting\
highfalutin' \highfalutin'\adj.
   Affectedly genteel; pretentious; haughty; snobbish. [Written
   also hifalutin.] [informal]

   Syn: grandiose, hifalutin, hoity-toity, la-di-da.
        [WordNet 1.5] highfalutin

The Collaborative International Dictionary of English v.0.48:

highfalutin \high`fa*lu"tin\, highfaluting \high`fa*lu"ting\, n.
   [Perh. a corruption of highflighting.]
   High-flown, bombastic language. [Written also hifalutin.]
   [Jocular, U. S.] --Lowell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

highfaluting
    adj 1: affectedly genteel [syn: grandiose, hifalutin,
           highfalutin, highfaluting, hoity-toity, la-di-da]