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boo
01
used to vocalize disapproval, dissatisfaction, or disdain, particularly in response to something disliked or unwelcome
Disapproving
Examples
The singer forgot the lyrics. Boo!
to boo
01
show displeasure, as after a performance or speech
Boo
01
a cry or noise made to express displeasure or contempt
02
a close friend, romantic partner, or significant other
Slang
Examples
She 's been my boo for three years.
