A guy steps on home plate.
The crowd doesn't like that guy.
They shout "BOO".
"Boo, you stink a lot you bad player."
ayon kay medium bro ika-03 ng Disyembre, 2006

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Sound that a fake ghost would make
Ghost:BOOOO!
Child:AHHHHHHH!
ayon kay BEYONCE ika-08 ng Nobyembre, 2003

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Never ever gonna get butt love. Not even if there's a fire.
You: Hey how bout some bf later?

Me: booooo

Never gonna have it.
ayon kay Beefy one ika-28 ng Setyembre, 2013

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the incorrect spelling for the word Beau. most commonly used by people who have heard the word but do not know how to spell it. beau meaning: boyfriend or girlfriend. boo meaning: what a ghost says.
went out with my beau last night.
the ghost screamed boo
ayon kay chitownpaul ika-12 ng Oktubre, 2011

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a word you yell at someone who keeps staring at you.
Boo!!What are you looking ugly.
ayon kay Drucilla Coleman ika-20 ng Hunyo, 2007

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A word used to scare people.
Guy: "BOO!"
Guy2: "omgwtfbbq"
ayon kay Gracin ika-11 ng Hulyo, 2005

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A word used to scare a person
Person 1: BOOOO!!!
Person 2: AHHH!!!
ayon kay Reagan Lausche ika-21 ng Pebrero, 2005

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The Urban Dictionary Mug

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The Urban Dictionary T-Shirt

Smooth, soft, slim fit American Apparel shirt. Custom printed. 100% fine jersey cotton, except for heather grey (90% cotton).

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