The Collaborative International Dictionary of English v.0.48:

Blatherskite \Blath"er*skite\, n.
   A blustering, talkative fellow. [Local slang, U. S.]
   --Barllett.
   [1913 Webster]

WordNet (r) 3.0 (2006):

blatherskite
    n 1: foolish gibberish [syn: blather, blatherskite]