boo

Sound that a fake ghost would make

Ghost:BOOOO!
Child:AHHHHHHH!

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boo

A word used to scare people.

Guy: "BOO!"
Guy2: "omgwtfbbq"

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boo

A word used to scare a person

Person 1: BOOOO!!!
Person 2: AHHH!!!

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Boo

A scary ghost creature in the Mushroom Kingdom. Mario faces these a lot. These pearly-white ghosts will become invisible if anyone faces them. They usually cannot be disposed of. There are also other Boos, like the Big Boo, King Boo, and more.

"I thought I heard a Boo, but I turned around and saw nothing."

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Boo

A ghetto term of endearment for your significant other. Possibly for your baby momma.

"Heather is my Boo, now and fo-eva fo-sho"

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boo

A guy steps on home plate.
The crowd doesn't like that guy.
They shout "BOO".

"Boo, you stink a lot you bad player."

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boo boo

1)when someone is an idiot

2)something has gone bad or is gone

josh: hey where did that bowl go?
brandon: right here bro, damn that shit is boo boo

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