A name for someone who is always there for you, and who unconditionally loves you.

Usually used for a boyfriend/girlfriend, but is also used for someone you love and is significant in your life.
I love you boo.
by MakeYouSmile May 29, 2010
affectionate name for your girlfriend/boyfriend

used in that old Usher song, My Boo

'you will always be my boo'
i love my boo, he's da sweetest ^___^
by heavily/endowed. January 12, 2008
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
A cute way to express displeasure, or sympathetic feelings.

A shortened version of boo urns.
Person 1: "I don't want to go to work today"
Person 2: "Boo, work!"

Person 1: "My sister's kitten is sick"
Person 2: "Boo, sick kitty!"
by Naughtybat August 09, 2006
An affectionate name for someone you're in love with
I love my boo

and other stuff like that, cause boo's are awesome.
by Amandrew March 15, 2006
An amazing and perfect girlfriend the best any guy could ask forr usually refers to her boyfriend as googly bear she will always be the cutest nd sweetest girl you have ever met the love of her boyfriends life no doubt that hell want to marry her
She's my Boo.
by Tyler-ToT February 20, 2011
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