boo

A loud exclamation intended to scare someone, especially a child. Usually used when one has been hidden from the victim and then suddenly appears 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.

A derisive shout made to indicate disapproval.

USCanadaAAVEslangA close acquaintance or significant other.

slangCannabis.

A tail feather from an ostrich.

A cry or noise made to express displeasure or contempt

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.”

now rareNorthern EnglandTo make a sound characteristic of cattle; to moo.

childishUSTo defecate.

Show displeasure, as after a performance or speech