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."
מאת SeaCaptainDrake 6 בדצמבר, 2003
N.- A person who is usually small and very cute. Boo's are everywhere and there are more of them coming everyday. According to prophecy, the Boo's will eventually take over the world and cover it in cuteness. Boo's must follow 3 main commandments, do not drink, do not smoke, do not have sex before marriage. Boo's are dangerous, but not in violence, in Cuteness. The leader of the Boo's is Bailey "Boo" Wright. BEWARE OF THE BOO'S!!!!!!!

P.S.- Boo's are relatives of Foofs
A cute person, a boo
מאת theboo 24 בפברואר, 2011
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 !!!
מאת londonengland112 7 בפברואר, 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.
מאת lol.it.babe=) 3 ביוני, 2009
An ancient mating ritual involving the death of the male.
Bob: Come Charlie! Lets do some boo.


Charlie: I'll see you on the flipside...
מאת Oilhater 14 ביוני, 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"
מאת nick zanko 15 באוגוסט, 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!
מאת Danny Peterson 26 בינואר, 2004

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