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Boo is a hamster who serves as the animal companion of the berserk ranger Minsc from the Baldur's Gate series of computer games. Minsc claims Boo is a miniature giant space hamster.
Minsc will lead with blade and boot! Boo will take care of the details.
by Jason Attard October 22, 2004
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23
expression of dissapproval.
B. Gates: This is the all-great Windows XP.

Me: boo!
by vin July 22, 2004
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25
what a ghost says when it jumps out of a closet and scares you.
Ghost:"Boo! I want to eat you for dinner!"


kid:"ok"
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27
A pet name created by those who are entirely devoid of describing their true feelings for their significant other.

In other words? A "loving" term thought up by lazy, inconsiderate imbeciles.
"Oh, like, I SOOOOOO love you, Boo!"
by Magmeezie August 29, 2003
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28
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."
by SeaCaptainDrake December 06, 2003
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