term used to signify something you don't approve of. origin comes from booing people on stage.
A girl walks by dressed horrifically.

Respones: "look at that girl, now that's a boo"
by jasev May 06, 2004

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Marijauna, pot.
I like boo, it keeps me happy the whole day because I don't know what the hell I'm doin.
by um..... Mr. Cheese December 23, 2002

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Used to call your friends this. Way different meaning than a babe or baby. Girls usually call each other this. If a girl call a guy this it doesn't mean anything, she's just being friendly.
Rosa: hi boo!
Eric: hi friend!
by jesssyyy.___ September 13, 2016

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Boo is the gay nice version of bitch when bitch is not the best word.
Oh boo you're gonna be ok.
by Boo_is_real May 26, 2016

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Word of endearment assigned to a significant other, often used by "ghetto" black people, uncivilized caucasians...preppy white girls.
"Ooo girl he my boo, he my baby daddy doe.."

"Hey lil mammi you wanna be my boo? You lyk3 whit3 ch0c0l4t3?"

"OmGee Branden is totally my boo"
by Futilepassion January 26, 2015

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Slang terminology for marijuana
I got high off that boo last night!!!
by Shont3 May 18, 2010

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1. A verbal punch in the face. Often a very straight forward insult, statement or event causing extreme embarrassment and (or) pain to ones ego.
1.

guy A: im leet

Guy B: No, Your A Noob

Guy B And C: BOOS!

2.

Guy A: The Chinese Are Gay

Guy B: Your Chinese!!!

Guy B And C: BOOS!

3.

(Guy A Faceplants In Dirt While Attempting a Slide At Baseball)

Everyone: Boos!
by jack Vegas the Ripper February 16, 2010

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