The Collaborative International Dictionary of English v.0.48:

Hubbub \Hub"bub\, n. [Cf. Whoobub, Whoop, Hoop, v. i.]
   A loud noise of many confused voices; a tumult; uproar.
   --Milton.
   [1913 Webster]

         This hubbub of unmeaning words.          --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hubbub
    n 1: loud confused noise from many sources [syn: hubbub,
         uproar, brouhaha, katzenjammer]