A term used to scare the frightened.
BOO! OMG you scared the shit out of me!
بواسطة Jared or J-RAD! مارس/آذَار 23, 2008

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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!"
بواسطة Magmeezie أغسطس/آب 29, 2003

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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.
بواسطة Jason Attard أكتوبر/تشرين الأوّل 22, 2004

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someone you love or adore
that's my boo
بواسطة barunsbutt مارس/آذَار 26, 2014

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Used to convey ones disapproval or disgust of something.
Guy 1: Hey, check out that sweet Honda.

Guy 2: Boo to Hondas and Boo to you.
بواسطة Little Dog Monk أغسطس/آب 29, 2006

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Disapproval.
Guy1. Yo this one time....
Guy2. Boo!!
بواسطة hasselhoffman فبراير/شباط 26, 2009

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Word used when expressing your disdain when somebody changes their mind about something, i.e. after something improves and is worthy of their notice.
You didn't say boo to the White Sox until they won the world series.

That guy never said boo to you until you lost all that weight.
بواسطة Paddlegurl نوفمبر/تشرين الثّاني 8, 2005

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