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Kakayama is when two guys from Naruto, Kakashi and Yamato, are forced to be a gay couple by stupid fans. They don't want to be, but the fans keep pushing it, and now there's like a million books about them doing stupid shit together.
"I swear if Kakashi doesn't kiss Yamato in the next chapter I'm gonna quit fanfic."
DM: "Why can't Kakashi just be with Sakura?" Reply: "Because Yamato is here and he's annoying."
Fanbook title: 'Kakashi and Yamato: A Love Story (That No One Asked For)"