WIKTIONARY

boo

Interjection

∙ 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.

Noun

Verb

Noun

∙ A close acquaintance or significant other. US, African American Vernacular, slang

Boo

Proper noun

Proper noun

English Dictionary

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