boo 

The word a ghost says to you to say "hi!"

Ghost: Boo!
Me: How are you?

boo by Ghost33 August 16, 2009

boo 

Used to convey ones disapproval or disgust of something.

Guy 1: Hey, check out that sweet Honda.

Guy 2: Boo to Hondas and Boo to you.

boo by Little Dog Monk August 30, 2006

boo 

what a ghost says when it jumps out of a closet and scares you.

Ghost:"Boo! I want to eat you for dinner!"


kid:"ok"

boo by Shannon and autumn are the best. August 15, 2005

Boo 

Boo is a hamster who serves as the animal companion of the berserk ranger Minsc from the Baldur's Gate series of computer games. Minsc claims Boo is a miniature giant space hamster.

Minsc will lead with blade and boot! Boo will take care of the details.

Boo by Jason Attard October 22, 2004

boo 

one of the most annoying things a ditzy girlfriend will call her boyfriend.

Girl's Twitter: OMG I CAN'T WAIT TO SEE MY BOO!!!! <33
Rest of the world: Shut the fuck up!

boo by Erin_12_22 October 10, 2009

Boo 

The scariest thing ever

"BOO!"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"

Boo by SLAP 'NOTHER CLAM ON THERE April 28, 2022

boo 

Disapproval.

Guy1. Yo this one time....
Guy2. Boo!!

boo by hasselhoffman February 26, 2009