1. Boyfriend or girlfriend
2. Word used to scare people
1. Can you handle me? If you can't you ain't gonna be my boo.

2. Guy: BOO!
Guy 2: Holy sh*t!
by Antony June 08, 2004
A pet name created by those who are entirely devoid of describing their true feelings for their significant other.

In other words? A "loving" term thought up by lazy, inconsiderate imbeciles.
"Oh, like, I SOOOOOO love you, Boo!"
by Magmeezie August 29, 2003
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
A ghetto term of endearment for your significant other. Possibly for your baby momma.
"Heather is my Boo, now and fo-eva fo-sho"
by Patricia Reyes March 04, 2007
A term used to scare the frightened.
BOO! OMG you scared the shit out of me!
by Jared or J-RAD! March 23, 2008
Disapproval.
Guy1. Yo this one time....
Guy2. Boo!!
by hasselhoffman February 26, 2009
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
by Geem-Unit January 23, 2007
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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