Some1 who invented spells at hogwarts, killed dumbledore and was called Snape
Person1: Snape is the Half-blood prince
Person2: Rally? Y U Tell Me! >.<
Person1: cos u didnt know he kills dumbldore!
person2: ARGGGG! the plot is ruined!
by 1AM1337 July 19, 2005
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A textbook (usually old) with lots of very helpful writing on the inside of it.

The name comes from the sixth Harry Potter novel/movie.
Joe: whoa, look at my copy of Hamlet, it explains what they're saying!
Bob: looks like you've got a half-blood prince book
by mrbattleman November 29, 2010
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This is a great 6th book in which Severus Snape kills Dumbledore, on page 606, go ahead and read, great book, oh yeah, and dumbledore dies, snape kills him.
Harry: Hagrid..Snape..killed Dumbledore
Hagrid: Wha' Harry?
by Reaperus July 17, 2005
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Harry Potter And The Half Blood Prince is the book in which Dumbledore dies and the wizarding world comes to an end as we know it.
Harry Pottter Fans *reads Harry Potter And The Half Blood Prince*
Dumbledore *dies*
Harry Potter Fans *omg*
by goofuffle May 26, 2006
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