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To picone someone is to spoil the ending of a book for someone else.

It is also possible to pocown someone, which is similar to making a really good burn.
Piconer: 'Hey, did you finish that book?'
Someone: 'No, why?'
Piconer: 'Everyone dies'
Someone: 'Damnit! Stop piconing every book I read!'
by xulise May 17, 2012