A small spherically shaped ghost that is only visable when your back is turned.
Mario tried to kill the boo, but every time he turned around to hit it, it vanished.
by naveregnide May 22, 2007
Get the merch
Get the Boo neck gaiter and mug.
A term of endearment and affection used to identify your perfect counterpart. Your "boo" is extremely complementary to your own personality, and is always willing to take on any adventure with you, without hesitancy. Always there for you, one can never become sick of their "boo." Times together are a good time to be had by all, and times apart come with a significant void that can only be filled by 1 person - your boo.
Boo 1: Damn I miss my Boo.
Boo 2: Don't worry, we'll get some Boo to the Two time on again soon.
Boo 1: I hope so, I need everything I do to be fun again. As long as I'm with my Boo nothing can ever be lame.
by bernice jacobson October 02, 2009
Get the mug
Get a Boo mug for your guy Rihanna.
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
Get the mug
Get a boo mug for your bunkmate Trump.
1.someone that you like/love; girlfriend/boyfriend
2.someone of the opposite sex that has the potential to be hubby/wifey material; not quite boyfriend/girlfriend yet
3.could also be a friend or particular person you like
1. "I'm on the phone with my boo!!"
2. "Girl I got me a new boo!!"
3. Person 1: "Hey girl!"
Person 2: "Hey boo!"
by indianb3@utii09 March 29, 2008
Get the mug
Get a boo mug for your papa Callisto.