A cute way to express displeasure, or sympathetic feelings.

A shortened version of boo urns.
Person 1: "I don't want to go to work today"
Person 2: "Boo, work!"

Person 1: "My sister's kitten is sick"
Person 2: "Boo, sick kitty!"
by Naughtybat August 09, 2006

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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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a word you yell at someone who keeps staring at you.
Boo!!What are you looking ugly.
by Drucilla Coleman June 20, 2007

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A word used by a girl to slowly choke the independence away from someone she cares about. Usually interpreted as harmless and affectionate, a significant person in your life introduces this word as a caring pet name. This is a disguise for the shackles just attached to your manhood by your girl.
"He's MY boo!"

"Hey boo, what you doin' tonight?
Spending time with me, not your boys?"
by Ozoneparadise February 23, 2007

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A word used to scare people.
Guy: "BOO!"
Guy2: "omgwtfbbq"
by Gracin July 11, 2005

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A word used to scare a person
Person 1: BOOOO!!!
Person 2: AHHH!!!
by Reagan Lausche February 21, 2005

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when i ghost says Boo, it means I am a gohst, fear me.
Courtney is walking into a haunted house, a ghost pop up and says Boo! ...
by F4TE September 04, 2004

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A non-gender specific name/term of endearment inferring affection but not necessarily

Also be used as a non distinct friendly nickname that indicates comfort and familiarity that in no way means any commitment too anyone
I can hardly wait until my boo gets a chance to be there.
by JR Seeow March 07, 2017

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