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.

(slang) Cannabis.

(now rare, Northern England) To make a sound characteristic of cattle; to moo.

A derisive shout made to indicate disapproval.

(intransitive) To shout extended boos derisively. / (transitive) To shout extended boos at, as a form of derision.

A tail feather from an ostrich.

A disapproving exclamation by a member of an audience.

present participle of boo

Third-person singular simple present indicative form of boo

plural of boo