Definition

/buː/

noun

verb

To shout extended boos derisively.
“When he took the podium, the crowd booed.”
To shout extended boos at, as a form of derision.
“The protesters loudly booed the visiting senator.”

interjection

A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appeared unexpectedly.
Used ironically in a situation where one had the opportunity to scare someone by speaking suddenly.
An exclamation used by a member or many members of an audience, as at a stage play or sports game, to indicate derision or disapproval of what has just occurred.