The Collaborative International Dictionary of English v.0.48:

gobbledegook \gobbledegook\, gobbledygook \gobbledygook\n.
   The incomprehensible or pompous jargon of specialists; as,
   psychoanalytic gobbledygook.
   [WordNet 1.5]

WordNet (r) 3.0 (2006):

gobbledygook
    n 1: incomprehensible or pompous jargon of specialists

Moby Thesaurus II by Grady Ward, 1.0:

93 Moby Thesaurus words for "gobbledygook":
   Aesopian language, Babel, Greek, Washingtonese, absurdity,
   amphigory, argot, babble, babblement, balderdash, bibble-babble,
   blabber, blather, bombast, bombastry, bull, bunkum, cant, cipher,
   claptrap, code, cryptogram, double Dutch, double-talk, drivel,
   drool, federalese, fiddle-faddle, fiddledeedee, flummery, folderol,
   fudge, fustian, gabble, galimatias, gammon, garbage, garble,
   gibber, gibberish, gibble-gabble, gift of tongues, glossolalia,
   highfalutin, hocus-pocus, hot air, humbug, jabber, jabberwocky,
   jargon, jumble, lingo, malarkey, mumbo jumbo, narrishkeit,
   niaiserie, noise, nonsense, official jargon, officialese,
   pack of nonsense, palaver, patois, patter, phraseology,
   political doubletalk, poppycock, prate, prattle, pussyfooting,
   rant, rigamarole, rigmarole, rodomontade, rubbish, scatology,
   scramble, secret language, skimble-skamble, slang,
   stuff and nonsense, stultiloquence, taboo language, trash,
   trumpery, twaddle, twattle, twiddle-twaddle, vaporing, vernacular,
   vocabulary, vulgar language, waffling