1 definition by M!ZZ.

a term for someone or something that is lame.
not good. Something you disagree with.
A word used when you don't like an action that is occurring. such as the movie hook's "bad form"
1. you can't come to the party? Boo!
2. you told me you were sick, your performance was Boo

"Hey you got a nice ass can i have it?"
"Boo!!! hell no!"
by M!ZZ. July 4, 2009
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