A ghost enemy in the franchise Super Mario. Some people use it as a name for thier love, when really they're calling thier love a fucking ghost.
-"My boo is so sweet, we kissed during the movie.."

~"How the fuck do you kiss a ghost?"
de Woofenstein 26 octobre 2014
A term used when someone is looking too hard and or gives you a "dirty look."
**Girl/Guy whom you do not know or get along with looking at you crazy**

You:boo! Can I help you?
___________________________________________________
**Person looking at you with disapproval**
You: boo! Do you have something to say?lol**
de That what I said! lol 8 janvier 2011
a word you yell at someone who keeps staring at you.
Boo!!What are you looking ugly.
de Drucilla Coleman 20 juin 2007
A guy steps on home plate.
The crowd doesn't like that guy.
They shout "BOO".
"Boo, you stink a lot you bad player."
de medium bro 3 décembre 2006
Sound that a fake ghost would make
Ghost:BOOOO!
Child:AHHHHHHH!
de BEYONCE 8 novembre 2003
Never ever gonna get butt love. Not even if there's a fire.
You: Hey how bout some bf later?

Me: booooo

Never gonna have it.
de Beefy one 28 septembre 2013
the nickname for a present girlfriend/boyfriend or ex girlfriend/boyfriend that you really/still care for. somone that you will always remember.
1st example: friend-dude your ex girlfriend is calling you should i hang up? yourself-nahh shes my boo

2nd example- i love her, shes my boo!
de u already knoww 13 juillet 2010

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