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n A derisive shout made to indicate disapproval.

! 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.

! A word used ironically in a situation where one might have scared someone, but said someone was not scared. Not said as loudly as in definition 1.

! 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.

n (US|slang) A close acquaintance or significant other, derived from French beau.

v (intransitive) To shout extended boos derisively.

v (transitive) To derisively shout extended boos at.