Otaku (オタク) means a fan who has gone all in on a hobby, usually anime, manga, or video games, to the point where the hobby becomes a big part of who they are. It can still sting as an insult from someone who thinks the person needs to get out more. But plenty of otaku wear the word with pride now, and it has spread around the world as a label fans use for themselves.
From "your house" to a whole identity
The word has an odd history. Otaku (お宅) started as a very polite way to say "your house," and by extension, "you." In the 1980s, some anime and computer fans began using it to address each other, since it kept a formal distance even between people who barely knew one another. Outsiders noticed the habit and picked up the word as a label for the whole group. What began as a polite pronoun ended up naming a kind of person.
From insult to badge of honor
For years, "otaku" carried a real sting. It called up an image of someone who barely left their room, who cared more about a fictional world than the real one. Akihabara became known as the district built around this crowd, full of shops selling manga, figures, and games. Slowly, the word softened. Big fan conventions, hit anime, and otaku who built real careers around their obsession made the label harder to look down on. Today plenty of people call themselves otaku without a second thought, and some are even proud that a hobby taught them a skill or a whole community.
Words & idioms to take away
Idioms & proverbs to carry away
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推し (oshi): "my favorite," the character, idol, or performer a fan supports above all others. Saying "who's your oshi" is a normal question in otaku circles.
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沼 (numa): literally "swamp." Getting into a hobby so deep you can't easily get out is called falling into the numa.