A scary ghost creature in the Mushroom Kingdom. Mario faces these a lot. These pearly-white ghosts will become invisible if anyone faces them. They usually cannot be disposed of. There are also other Boos, like the Big Boo, King Boo, and more.
"I thought I heard a Boo, but I turned around and saw nothing."
di SeaCaptainDrake 06 dicembre 2003
This word is used in a replacement of any cuss word.
Id boo that !!!
My left ankle hurts like a freaking boo !!!
Ill will boo you up if you dont shut up !!!
di londonengland112 07 febbraio 2010
Basically it means like forget you.
*1. Someone keeps staring at you, you say "Boo Bitch! Whatchu lokkin at?!?!?!"

*2. Girl 1: Hey can you hang out today???

Girl 2: No sorry...

Girl 1: Boo, you whore!!! You suck.
di lol.it.babe=) 03 giugno 2009
An ancient mating ritual involving the death of the male.
Bob: Come Charlie! Lets do some boo.

*stab*

Charlie: I'll see you on the flipside...
di Oilhater 14 giugno 2008
a term used in prison referring to someone as your bitch but the term has been taken out by the black man to the urban streets as your loved one
black man- "yea thats right mother fucker you take it cuz you always gonna be my boo"
di nick zanko 15 agosto 2006
The name of the Peterson's pet cat (until dad let it go stray right round near the animal auction).
Oh no, Boo peed on the red couches again!
di Danny Peterson 26 gennaio 2004
something you say when someone is stareing right at you and you look at them and they are still looking at you, you say boo in a wat are you looking at voice and they stop looking at you!!!
girl#1:(looks at a gurl and she looking at her) boo wat you looking at lil ugly
girl#2:rolls her eyes and stops looking
di *gloria* 22 aprile 2008

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