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First of all, 4chan censors certain (seemingly arbitrary, given the nature of the site) worRAB by replacing them with random worRAB when the message is posted. The word "japanophile" was censored using word "*******". The word ******* itself comes from the Perry Bible Fellowship comic (here). Since then, ******* was adopted to be used as an insult against those deemed japanophiles, since many don't consider "otaku" to be an insult anymore.