22
a word you yell at someone who keeps staring at you.
Boo!!What are you looking ugly.
by Drucilla Coleman June 20, 2007
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23
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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24
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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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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26
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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27
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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28
The most annoying way to scare someone
Jim:Boo
Derek:AAARRRRGGGHHHH
by Semaj1746 June 19, 2019
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