boo

1.（对演员、讲话者等表示不满）嘘a sound that people make to show that they do not like an actor, speaker, etc.

1.[i][t]发嘘声；喝倒彩to show that you do not like a person, performance, idea, etc. by shoutingboo

1.〈美俚〉大麻;粉蓝烟草

1.呸

1.发出“呸”的音

2.对...发“呸”声(以示轻蔑等)

1.you shout “boo” suddenly when you want to frighten someone as a joke

2.people in an audience shout “boo” to show that they disagree with a speaker or dislike a performance

1.to shout at a speaker or performer, to show that you disagree with them or that you think they are not very good