boo

noun

A derisive shout made to indicate disapproval.

1. To shout extended boos derisively.

   When he took the podium, the crowd booed.

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

   The protesters loudly booed the visiting senator.

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.

noun

A close acquaintance or significant other.

noun

Cannabis.