Boo 

Someone you love. Someone you care about. Someone who is a life time best friend.
Someone who is always there for you. Someone who is extremely pretty. Someone who is very important in your life. Someone who can make you laugh. Someone who you can never replace.

I love Harrie, she’s my boo

Boo by Mafaaa September 13, 2018

boo 

someone you love or adore

that's my boo

boo by barunsbutt May 6, 2014

Boo 

A boo is a girl/guy that can be there for you whenever you need them therefore you might even call your love one boo

Hey,"boo" how is it going.

Boo by Wiley_Redcrane23 February 15, 2015

Boo 

1. Someone you love and adore.
2. An exclamation capable of giving old people cardiac arrest

I love her, she's my boo.

Person 1: BOO!
Person 2: dies of cardiac arrest

Boo by yvt4 July 23, 2019

Boo 

Its a big scary

Tony: boo
Mark: ahhh
Tony: oh hi mark

Boo by Whatacunundrum September 2, 2020

boo 

a greeting commonly used by slayra

Slayra scared me last night, she went boo while I was listening to Oliver Sykes, and then Oliver Sykes screamed simultaneously as I threw the phone across the room.

boo by Fayra <3 November 5, 2022

Boo 

Your boyfriend or girlfriend

Often used in the 2000's

I'm going to call my boo.

Boo by Walkingdeadlovercarlsrighteye May 23, 2016