abracadabra, babble, blabber, burble, double Dutch, double-talk, drivel, gabble, gibber, gibberish, jabber, jabberwocky, nonsense, prattle, slobber

blah(also blah-blah), hocus-pocus, hokeypokey, twaddlechatter, gab, patter, prate, tattle, twittercackle, clack, clatter