15
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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16
The word a ghost says to you to say "hi!"
by Ghost33 August 16, 2009
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17
A term used to scare the frightened.
by Jared or J-RAD! March 23, 2008
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18
expression of dissapproval.
B. Gates: This is the all-great Windows XP.

Me: boo!
by vin July 22, 2004
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19
Guy1. Yo this one time....
Guy2. Boo!!
by hasselhoffman February 26, 2009
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20
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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21
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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