boo
boo1 /buː/ 
verb [intransitive and transitive]
to shout ‘boo’ to show that you do not like a person, performance, idea etc:
Some of the audience started booing.
She was booed off stage (=they shouted ‘boo’ until she left the stage).
boo2 interjection
2. a word you shout suddenly to someone as a joke in order to frighten them
3. wouldn’t say boo to a goose an expression used to describe a shy quiet person
| I |
verb [intransitive and transitive]to shout ‘boo’ to show that you do not like a person, performance, idea etc:
| II |
interjection Date: 1800-1900
Origin: Natural sound
1. a noise made by people who do not like a person, performance, idea etcOrigin: Natural sound
2. a word you shout suddenly to someone as a joke in order to frighten them
3. wouldn’t say boo to a goose an expression used to describe a shy quiet person