boo

1 - A derisive shout made to indicate disapproval.

1 - To shout extended boos derisively.

2 - To shout extended boos at, as a form of derision.

1 - 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.

2 - Used ironically in a situation where one had the opportunity to scare someone by speaking suddenly.

3 - 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.

1 - A close acquaintance or significant other.

1 - Cannabis.