The action of hoot, v. in various senses. Shouting, calling out, clamour; spec. calling out in execration or derision.

†(a) The contemptuous abrupt emission of breath from the lips (obsolete). (b) The uttering of words abruptly and heedlessly.

Perhaps: depreciatory or disparaging talk.

The action of expressing contempt for something; the action of dismissing something in a contemptuous manner; an instance of this.