boo 

the incorrect spelling for the word Beau. most commonly used by people who have heard the word but do not know how to spell it. beau meaning: boyfriend or girlfriend. boo meaning: what a ghost says.

went out with my beau last night.
the ghost screamed boo

boo by chitownpaul October 13, 2011

Boo 

Used to spook anyone at anytime.
Just hide behind a corner and say boo in a monotone voice at someone turning that corner they instantly die of spookedness

Person1: boo
Person2: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
Person2: *actually dies*

Boo by Meme man the madlad December 22, 2020

boo 

As in Boo of Monsters Inc.

Sulley: Boo!
Boo: Kitty!

boo by Monsters Inc Rules! October 30, 2003

Boo 

This term is used to describe a love for a significant other. This is a synonym for words such as baby, honey, sugar, my love, darling, and pumpkin.

My boo, how are you doing today?

Boo by Kalinoa August 26, 2005

boo 

a slang term used for marijuana

hey man, you got some boo?

boo by Lleni January 5, 2008

boo 

term used to signify something you don't approve of. origin comes from booing people on stage.

A girl walks by dressed horrifically.

Respones: "look at that girl, now that's a boo"

boo by jasev May 6, 2004

boo 

The act of moving your bowels.

Take a dump.

Pull over, I gotta boo.

My stomach hurts, I gotta boo.

boo by chillifromphilli June 4, 2009