The acronym of the band Born of Osiris.
"hey dude i heard boo was on summer slaughter tour"

"yeah its gunna be sick"
by KaseyKocaine July 30, 2008
Bitch On Occation;person of the opposite sex with whom you associate with and from time to time, do things as a couple.
"My Boo and I are going out to dinner tonight."
by Piggyadig March 17, 2008
Boss of old stature. A raid boss of pre-bc times.
A term used in world of warcraft.
Rag is a boos
by Z-diddyz January 25, 2009
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
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
As in Boo of Monsters Inc.
Sulley: Boo!
Boo: Kitty!
by Monsters Inc Rules! October 30, 2003

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