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.
noun
°A derisive shout (as interjection definition 4 above).
°A close acquaintance or significant other, derived from French beau.
verb
°To shout extended boos derisively.
°To derisively shout extended boos at.