Boo 

a nick name you call your boyfriend (girlfriend) or best friend and you can annoy the heck out of someone by saying boo nonstop

1. Hey my boo
2. Boo x10000

Boo by Melissa:) January 5, 2017

boo 

people use this word to there friends (if they have any)
or to there boyfriend/girlfriend or you can use this word to scare someone

i call my bestest friend boo cuz we are so close i also call other people boo such as shane dawson

hey "boo" how's it going

boo by theobomb April 20, 2018

boo 

1. boyfriend/girlfriend

3. YESs uhuhhh

1. “that’s my baby boo over there” “miss my boo”
2. girl #1: “liam hemsworth is so hot”
girl #2: “Boo!!!!!”

boo by ejf November 14, 2017

boo 

Someones girlfriend or boyfriend or someone they're talking to.

Boy: "Hey boo, come to my crib tonight."

boo by wserdtfyguhi November 29, 2017

Boo 

When you're so wasted that you fail to pronounce "Bro" so you just say "Boo"

"Boo can you pass the blunt?"
"Stop drinking for now, you're already wasted af Boo"

Boo by Kush_Barrel March 21, 2018

Boo 

Ghost friend

Jelit: after death, we'll be boo's
Digu: oh yeah!

Boo by Bundleoftantrums July 17, 2018

boo 

1. Someone you like
2. Scaring others
3. When a persons performs badly

1. I like my boo more than you do.
2. Kim Jong Un: Boo!
His Army: *Simulates being scared*
3. Boo! you stink!

boo by Ze_eT August 31, 2018