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
بواسطة Geem-Unit يناير 23, 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.
بواسطة Beefy one سبتمبر 28, 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!
بواسطة u already knoww يوليو 13, 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.
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!
بواسطة jack Vegas the Ripper فبراير 16, 2010
a word you yell at someone who keeps staring at you.
Boo!!What are you looking ugly.
بواسطة Drucilla Coleman يونيو 20, 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."
بواسطة medium bro ديسمبر 3, 2006
A word used to scare people.
Guy: "BOO!"
Guy2: "omgwtfbbq"
بواسطة Gracin يوليو 11, 2005

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