Adj. to feel sad or unhappy, N. a sad or unhappy person, Intj. a statement of unhappiness
Adj. I'm feeling very boo today.
N. You're such a boo.
Intj. Boo! (not a scary fast boo but a long drawn out unhappy yet loud boo)
by Kristin October 08, 2001
A white girl or acts like shes from the a different race. Usually while dating the other race.

That girl is acting like a BOO! From the Hamptons talking like shes from Detroit cus shes with a black man!
by james haynes May 14, 2008
Short for booger.
Snot.
"There is a boo in my nose."

"Don't rub that boo on me!"
by eb April 05, 2005
Boy or Girlfriend but just as annoying as the word Bae of the same meaning.
Gonna slap my Boo in the face.
by Rollerball April 06, 2015
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.
by Wiley_Redcrane23 February 15, 2015
Word of endearment assigned to a significant other, often used by "ghetto" black people, uncivilized caucasians...preppy white girls.
"Ooo girl he my boo, he my baby daddy doe.."

"Hey lil mammi you wanna be my boo? You lyk3 whit3 ch0c0l4t3?"

"OmGee Branden is totally my boo"
by Futilepassion January 26, 2015
A ghost enemy in the franchise Super Mario. Some people use it as a name for thier love, when really they're calling thier love a fucking ghost.
-"My boo is so sweet, we kissed during the movie.."

~"How the fuck do you kiss a ghost?"
by Woofenstein October 26, 2014

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