Boos is never given a concrete definition, only prefaced when its used with any context at any time, and may be used for both negative and positive reasons in the same sentence.
Person 1: i got the hookah.
Person 2: is it boos?
Person 1: its pretty boos.
Person 1: when you rollin in?
Person 2: tues night
Person 1: boos
Person 1: I'll be over in like 10 minutes.
Person 2: Boos.
Person 1: so hows phil
Person 2: Boos
ayon kay Geem-Unit ika-23 ng Enero, 2007
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
the nickname for a present girlfriend/boyfriend or ex girlfriend/boyfriend that you really/still care for. somone that you will always remember.
1st example: friend-dude your ex girlfriend is calling you should i hang up? yourself-nahh shes my boo

2nd example- i love her, shes my boo!
ayon kay u already knoww ika-13 ng Hulyo, 2010
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.

guy A: im leet

Guy B: No, Your A Noob

Guy B And C: BOOS!


Guy A: The Chinese Are Gay

Guy B: Your Chinese!!!

Guy B And C: BOOS!


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

Everyone: Boos!
ayon kay jack Vegas the Ripper ika-16 ng Pebrero, 2010
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
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
A word used to scare people.
Guy: "BOO!"
Guy2: "omgwtfbbq"
ayon kay Gracin ika-11 ng Hulyo, 2005

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