1. To disagree w/ ones comments. To show shock of a comment.
2. A nickname used to call a loved one
1. Boo!!! Aww no you didn't just say that!!
2. You know you're my Boo, baby I love you.
by Ms. V September 26, 2005

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Boo stands for Booty. Men have changed the meaning so their "woman" would not be offended by having the name booty. Women do not enjoy being labeled as property and men are much smarter than people think
MAN: Hey Boo!
Woman: Awww... you are so sweet
Man: I know.
by Grant March 31, 2005

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A truncation of the term "boojum" used in the movie "Rally 'Round the Flag, Boys!"which was based on the very humorous novel by Max Shulman. In the novel, Max used the word poontang shortened to poon. In 1958, poontang was not acceptable on screen; thus the substitute word boojum which had no prior meaninng and thus seemed neutral.
Army Private: "When we get to town, I'm gonna get me some Boo."
by Ludovico January 02, 2007

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Julia's word
person 1: "aww boo"
Julia: "wrong, Julia's word"
by Julia0828 November 10, 2008

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an affectionate name for the one you love lots and lots or the one you really like. a name for a boyfriend, girlfriend or partner etc. Regularly used in r'n'b songs.
eg. but luke, i want my cuddle my boo.
by katieboo April 19, 2007

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In the words of Usher, "There's always that one person that will always have your heart/you never see it coming 'cause you're blinded from the start/ know that you're that one for me/ it's clear for everyone to see/ oh baby, you will always be my BOO"
A guy sees his beautiful girlfriend and exclaims,"That's my boo right there!"
by how2bclassy101 August 14, 2006

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Extremely unattractive, fugly, a dog.

Rhymes with moose
Did you see that fat chick? Damn, she is boos!
by Stiggity October 13, 2005

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