Nerdfighters are all in a tizzy about TFIOS.

If that sentence doesn't make any sense to you, you may want to consult this John Green glossary to familiarize yourself with a cult teen movement that's breaking into the mainstream. Scroll through the terms below for definitions of the inside jokes, acronyms and lingo used by Mr. Green, a video blogger and best-selling author of young-adult novels, and his fans.

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