1: An affectionate name for someone you love.
2: Something that a ghost says.
3: The short version of my cat's name, Boo-Boo.
1: I like cuddling with my boo.
2: BOO!
3. "Boo, get out of the dishwasher!"
Word used when expressing your disdain when somebody changes their mind about something, i.e. after something improves and is worthy of their notice.
You didn't say boo to the White Sox until they won the world series.
That guy never said boo to you until you lost all that weight.
A term of endearment, like baby.
"I'll be in here, boo" -- Method Man (You're all I need 1994).
The word a ghost says to you to say "hi!"
Ghost: Boo!
Me: How are you?
Used to convey ones disapproval or disgust of something.
Guy 1: Hey, check out that sweet Honda.
Guy 2: Boo to Hondas and Boo to you.
what a ghost says when it jumps out of a closet and scares you.
Ghost:"Boo! I want to eat you for dinner!"
kid:"ok"