1. A verbal punch in the face. Often a very straight forward insult, statement or event causing extreme embarrassment and (or) pain to ones ego.
1.

guy A: im leet

Guy B: No, Your A Noob

Guy B And C: BOOS!

2.

Guy A: The Chinese Are Gay

Guy B: Your Chinese!!!

Guy B And C: BOOS!

3.

(Guy A Faceplants In Dirt While Attempting a Slide At Baseball)

Everyone: Boos!
by jack Vegas the Ripper February 16, 2010

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Slang term for marijuana, aka boo grass
This example will be in the form of a conversation:
"hey man, you got any boo?"
by Jason Bond 86 April 23, 2009

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marijuana, weed, dope
Boo is a term believed to have originated, or at least to have been popularized by, African-American jazz and pop musicians during World War II.
We smoked some boo. Song lyric from the 50's: "I sumokum booleyeaa, I smokum boo."
by Gunnter March 16, 2008

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Slang term for Marijuana hailing from the late sixties.
"This freak digs boo."
by DontReadThis January 01, 2006

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Your boyfriend or girlfriend

Often used in the 2000's
I'm going to call my boo.
via giphy

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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

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Another way of saying "okay" "good"
Guy1: You want food bro?

Guy2: nah i'm boo.
by Giggin November 17, 2013

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