A book which contains bitchy comments about other people, often friends, school mates, etc.
Person 1: OMG! Shes such a bitch, i can't believe she slept with my exboyfriend, what a slut!

Person 2: Let it out, put it in the burn book
by Jonathan Irvine April 18, 2006
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A site which contains bitchy comments about other people, including but not limited to friends, peers, celebrities, politicians, etc. An online burnbook as the name references does not need to be a physical book but can be a website such as burnbook.com.
In an online burn book I was called me a stupid whore who sleeps with anything and everything, regardless of sex or species and dead or alive.
by jwill101 September 12, 2010
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this is a burn book. urban dictionary has became a burn book if you haven't noticed. only worldwide. pff
-urbandictionary.com
-public restroom wall
-what you're reading right now is a burn book
by bobis August 19, 2007
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a book that people (mainly females) put nasty things about others in
Kylie: OMG!!!!! I fucking hate Jessica so fucking much cuz she slpet with mah bae Kyle!
Sarah: Put it in the burn book.
by Lolliepuff February 15, 2015
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(Taken from Mean Girls) A profane book used to describe people that you have utmost distaste for. Contains a picture, name, and reasons for their entry.
Girl 1: Omg, did you see Veronica?
Girl 2: Like yeah! What a Bitch!
Girl 1: She's going in the Burn Book!
by Ave Satanas676 December 22, 2008
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A term that originated from the 2004 movie 'Mean Girls'. It is a book the Plastics use to write nasty comments and start rumors/gossip about their classmates. Nowadays, it can be used to refer to any book that contains hateful comments about anything.
Got anything bitchy you want to say about someone? Put it in a burn book then!
by Thats16myboi June 20, 2020
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