1. a thing u can yell to scare someone...
(although you probably wanna hide behind a corner then jump out cause they wont expect that)
2. The ghost thing off the mario brothers game... you know
3. a significant other... guys usually say it to there girls
4. boo as in you are really bad and you should stop what your doing right now... or ill throw rotten food at u...
1. person 1: Boo!!
person 2: ahh!! aw its only you, you scared the hell out of me man.. dont do that again.

2. boo as in the ghost...

3. girl u know your my boo

4. Boo, get off the stage you suck...
by Melissa_0049 December 21, 2006
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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
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
pet name: your hunny,sweety,baby.
I love you boo.
by holly March 19, 2003
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
significant other, girlfriend,boyfriend,really close friend
hey baby boo
by this is rap ill m itch April 11, 2003
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
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

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