1. A fucking retarded name for ones partner.
2. A word used to scare someone.
3. A word commonly hollered at 50 cent, MCR, FOB, Nickelback, and P!ATD concerts.
1. (guy) hey wuzzup mah boo, u checkin it out to feel reel gud
(girl) shut the fuck up dumbass you sound like an idiot

2. (guy 1) BOO!
(guy 2) HOLY FUCKING SHIT YOU SKARED ME REEL GUD DARE
3.
(Announcer) And now, our final act, panic! at the disco!
(crowd) BOOOOOOOOOOOOO! HISSS!
by Shadow Creator December 11, 2007
An term that Black people call Caucasian people because they're as white as ghosts.
"Sup boo"

"Shit, look at that boo"
by Bebop32 August 12, 2007
what people say on bebo which really doesnt scare anyone.
1st person: BOO!
2nd person: Ahh u scared me *coughcough*

by Yazmin1010 April 09, 2008
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
A Boo is a small, fluffy round pink or white cloud-like creature. They are special unique things. They are usually quite almighty creatures and hold many powers. Special Boos have tiny wings and halos, representing and guarding the other not-so-special Boos. One thing about Boos, is they absolutely love Bears.
Boo: I love you, Bear
Bear: I love you, Boo.
by Holleh December 15, 2005
BOO is when you jump out and try to scare them by saying boo! BOO does NOT mean a boyfriend or girlfirend as the chavs above decided to put! grrr get it right fuckers!!!
person: BOO!!!!
person 2: whos dude you scared the crap outta me!
by i like spoons July 09, 2005

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