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 burnbook I was called me a stupid whore who sleeps with anything and everything, regardless of sex or species and dead or alive.
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 burnbook then!
(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!