Boo 

pet name: your hunny,sweety,baby.

I love you boo.

Boo by holly March 19, 2003

Boo 

A Boo is a type of ghost featured in Mario video games. Boos made their first appearance under the name of "Boo Diddly"(a play on Bo Diddley an early R&Bguitarist) in Super Mario Bros. 3 and was virtually invincible to all attacks with the exception of the Starman and the Hammer Bros. Suit.

"The Boo's in Paper Mario are soooooo cute!"

Boo by TheBlackMew September 7, 2006

boo 

significant other, girlfriend,boyfriend,really close friend

hey baby boo

boo by this is rap ill m itch April 11, 2003

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!"

boo by Loki August 24, 2003

boo 

Word used when expressing your disdain when somebody changes their mind about something, i.e. after something improves and is worthy of their notice.

You didn't say boo to the White Sox until they won the world series.

That guy never said boo to you until you lost all that weight.

boo by Paddlegurl December 28, 2005

boo 

A term of endearment, like baby.

"I'll be in here, boo" -- Method Man (You're all I need 1994).

boo by VAKI5 September 14, 2003

boo 

The word a ghost says to you to say "hi!"

Ghost: Boo!
Me: How are you?

boo by Ghost33 August 16, 2009