one of the most annoying things a ditzy girlfriend will call her boyfriend.
Girl's Twitter: OMG I CAN'T WAIT TO SEE MY BOO!!!! <33
Rest of the world: Shut the fuck up!
by Erin_12_22 October 10, 2009

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

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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.
by Little Dog Monk August 29, 2006

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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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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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Disapproval.
Guy1. Yo this one time....
Guy2. Boo!!
by hasselhoffman February 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.
by Paddlegurl November 08, 2005

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