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When your reading a popular book and a person who has already read the book comes up to you and asks how far you are in the book by revealing some major event in the book that you haven't read yet. This spoils the book and the person who asked the book buster is officially a dumbass.
Dumbass:Oh, you're reading Harry Potter and the Deathly Hallows!
Dumbass:Did you get to the part where they kill voldemort?

Book Buster!!!!!
by fghsgaergha September 20, 2012
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