|Synonyms:||fangirl, fanboy, otaku, Japanophile, weeb|
|See also:||anime, manga, Fangirl Japanese|
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The word indirectly came from "wapanese" (wannabe Japanese), a slur used to describe white Japanophiles. When increased usage of the word led to several heated disagreements on 4chan between anime/manga fans and everyone else, the moderators created a word filter that replaced every instance of the word "wapanese" with "weeaboo." Subsequently 4chan users adopted it in place of wapanese, and the usage has then since spread out to the general internet at large.
"Weeaboo" comes from a Perry Bible Fellowship comic strip.  The word itself originally referred to something undesirable and deserving punishment.
These days, the term has been shortened to "weeb," with self-confessed anime fanatics or Japanophiles adopting it as an affectionate term towards themselves or their friends.
- The Perry Bible Fellowship: Weeaboo (Accessed June 6, 2011)