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?"
av Woofenstein 26 oktober 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**
av That what I said! lol 8 januari 2011
a word you yell at someone who keeps staring at you.
Boo!!What are you looking ugly.
av Drucilla Coleman 20 juni 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."
av medium bro 3 december 2006
Sound that a fake ghost would make
Ghost:BOOOO!
Child:AHHHHHHH!
av BEYONCE 8 november 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.
av Beefy one 28 september 2013
A word used to scare people.
Guy: "BOO!"
Guy2: "omgwtfbbq"
av Gracin 11 juli 2005

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