The Collaborative International Dictionary of English v.0.48:

Hullabaloo \Hul`la*ba*loo"\, n. [Perh. a corruption of
   hurly-burly.]
   A confused noise; uproar; tumult. [Colloq.] --Thackeray.
   [1913 Webster]

WordNet (r) 3.0 (2006):

hullabaloo
    n 1: disturbance usually in protest [syn: agitation,
         excitement, turmoil, upheaval, hullabaloo]