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."

Boo by SeaCaptainDrake December 6, 2003

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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"

Boo by Patricia Reyes December 14, 2008

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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."

boo by medium bro December 6, 2006

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