boo

A loud exclamation intended to scare someone. Usually used when one has been hidden from the target, and then appears unexpectedly.

An exclamation used by a member of an audience, as at a stage play or sporting event, to indicate derision or disapproval.

I ask them to record their votes in my favour, and I ask, is there any man who will dare to call me a stranger (hear, hear, and booing)?

A derisive shout of the word 'boo' made to indicate disapproval.

...Hodgson headed down the tunnel with the boos of fans ringing in his ears after an eighth league defeat of the season...

Like a moustachioed pantomime villain relishing boos and hisses from the audience, Trump is oblivious to warnings and protestations from the sane world and simply contemptuous of the lickspittle mob desperately hoping to go unnoticed.

To shout extended boos derisively.

When he took the podium, the crowd booed.

Nobody booed and nobody clapped

To shout extended boos at, as a form of disapproval or derision.

The protesters loudly booed the visiting senator.