- An Exclamation in English used to evoke or suggest Surprise
- A Jeer , used to express one's distaste of a performance or action, especially in entertainment
- A character from the computer-animated film '' Monsters, Inc. ''
- A male rap artist, member of Young Money
- ''Boo!'', a South African pop group
- ''Boo!'', an English children's Edutainment show made with CGI techniques
- ''Boo!'', a 2005 low budget Horror Film .
- Boo (Dragon Ball) (also known as "Buu"), a character in the manga '' Dragon Ball ''/'' Dragon Ball Z '' and the anime ''Dragon Ball Z''
- Boo , a type of ghost that appears in some of Nintendo's Mario video games
- Boo Programming Language , an object-oriented, statically typed programming language for the Common Language Infrastructure
- Boo.com , an infamous Dot-com clothing company which turned into a high profile failure
- Boötes , standard astronomical abbreviation
- Boyfriend / Girlfriend , a slang term, usually considered to be Ebonics
- Pre- Tween Son or Daughter , a nickname perhaps derived from a character in the film '' Monsters, Inc. ''
- Marijuana , slang term
- The pet hamster of Minsc in the '' Baldur's Gate '' role-playing computer game series.
- '' Boo '' is the title of a short film produced in 1932 by Universal Studios that parodies its monster films of the time.
- Boo is a minor character in the webcomic series Megatokyo and acts as a conscience to Largo - one of the main characters.
is the name of two Communes in France :
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