Boo

A Boo is a type of ghost featured in Mario video games. Boos made their first appearance under the name of "Boo Diddly"(a play on Bo Diddley an early R&Bguitarist) in Super Mario Bros. 3 and was virtually invincible to all attacks with the exception of the Starman and the Hammer Bros. Suit.

"The Boo's in Paper Mario are soooooo cute!"

by TheBlackMew September 6, 2006

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.

by Jason Attard October 22, 2004

Boo

The scariest thing ever

"BOO!"
"AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"

by SLAP 'NOTHER CLAM ON THERE April 28, 2022

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

Boo

A ghetto term of endearment for your significant other. Possibly for your baby momma.

"Heather is my Boo, now and fo-eva fo-sho"

by Patricia Reyes March 5, 2007

Boo

The one. The one who will always be there for you no matter what the circumstances may be. If you have someone special...call them boo ^_^

"You're everything to me. I love you Boo"

by Tasher March 25, 2008

Boo

Slang term for marijuana, aka boo grass

This example will be in the form of a conversation:
"hey man, you got any boo?"

by Jason Bond 86 April 24, 2009