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?"
بواسطة Woofenstein أكتوبر/تشرين الأوّل 26, 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**
بواسطة That what I said! lol يناير/كانون الثّاني 8, 2011
a word you yell at someone who keeps staring at you.
Boo!!What are you looking ugly.
بواسطة Drucilla Coleman يونيو/حَزيران 20, 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."
بواسطة medium bro ديسمبر/كانون الأَوّل 3, 2006
Sound that a fake ghost would make
Ghost:BOOOO!
Child:AHHHHHHH!
بواسطة BEYONCE نوفمبر/تشرين الثّاني 8, 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.
بواسطة Beefy one سبتمبر/أيلول 28, 2013
A word used to scare people.
Guy: "BOO!"
Guy2: "omgwtfbbq"
بواسطة Gracin يوليو/تمُّوز 11, 2005

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