WordWeb Online

1. Affectedly genteel; to carry an air of affected importance; to be snobbish and haughty
   "The staff found it difficult to deal with the hoity-toity snooty clients";
   - grandiose, hifalutin [informal], highfalutin [informal], highfaluting [informal], la-di-da [informal], lah-di-dah [informal], la-de-da [informal]

See also: pretentious

Encyclopedia: Hoity-toity