The Collaborative International Dictionary of English v.0.48:

Hoity-toity \Hoi"ty-toi`ty\, a. [From Hoit.]
   Thoughtless; giddy; flighty; also, haughty; patronizing; as,
   to be in hoity-toity spirits, or to assume hoity-toity airs;
   used also as an exclamation, denoting surprise or
   disapprobation, with some degree of contempt.
   [1913 Webster]

         Hoity-toity! What have I to do with dreams? --Congreve.
   [1913 Webster]

WordNet (r) 3.0 (2006):

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