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30.
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
 
1.
boo
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
 
2.
boo
boo is a term that is derived from the French word "beau" meaning beautiful. In 18th century England it meant an admirer, usually male. It made it's way into Afro-Caribean language perhaps through the French colonisation of some Caribean islands.

Now meaning girl or boyfriend
"this is what I'm saying boo, it's all about you"
by juicy February 14, 2004
 
3.
Boo
pet name: your hunny,sweety,baby.
I love you boo.
by holly March 19, 2003
 
4.
boo
1) Boyfriend or girlfriend. Term of endearment.

2) A loud, abrupt yell, meant to frighten someone.

3) A sound made to indicate disapproval, the opposite of "yay."
1- Some Guy: "Hey boo."

2- Ghost: "BOOO!"

3- Unhappy Audience: "Booooooo...."
by Larr February 14, 2008
 
5.
boo
significant other, girlfriend,boyfriend,really close friend
hey baby boo
by this is rap ill m itch April 11, 2003
 
6.
boo
1: An affectionate name for someone you love.

2: Something that a ghost says.

3: The short version of my cat's name, Boo-Boo.

1: I like cuddling with my boo.

2: BOO!

3. "Boo, get out of the dishwasher!"
by Loki August 24, 2003
 
7.
boo
A term of endearment, like baby.
"I'll be in here, boo" -- Method Man (You're all I need 1994).
by VAKI5 September 14, 2003