heckling

from WordNet (r) 3.0 (2006)

heckling
    n 1: shouting to interrupt a speech with which you disagree
         [syn: {heckling}, {barracking}]

from The Collaborative International Dictionary of English v.0.48

heckling \heckling\ n. [vb. n. from {heckle}[2].]
   Shouting in order to interrupt a speech with which the
   shouter disagrees.

   Syn: barracking.
        [WordNet 1.5]