boo

Disapproval.

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

by hasselhoffman February 26, 2009

boo

A pet name created by those who are entirely devoid of describing their true feelings for their significant other.

In other words? A "loving" term thought up by lazy, inconsiderate imbeciles.

"Oh, like, I SOOOOOO love you, Boo!"

by Magmeezie August 29, 2003

boo

expression of dissapproval.

B. Gates: This is the all-great Windows XP.

Me: boo!

by vin July 22, 2004

boo

Sound that a fake ghost would make

Ghost:BOOOO!
Child:AHHHHHHH!

by BEYONCE November 8, 2003

boo

A word used to scare people.

Guy: "BOO!"
Guy2: "omgwtfbbq"

by Gracin July 29, 2005

boo

A word used to scare a person

Person 1: BOOOO!!!
Person 2: AHHH!!!

by Reagan Lausche February 21, 2005

Boo

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."

by SeaCaptainDrake December 6, 2003