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A factinista is someone who thinks they know everything just because they read a book. They'll argue with you like you're stupid.
'The moon is made of cheese!' I said. The factinista yelled, 'That's not in the book!'
My teacher is a factinista. She failed me for saying pizza is better than cake.
I asked a factinista if dogs can fly. She said, 'No. Read the book.'