otaku

 
Pronunciation: /əʊˈtɑːkuː/

noun (plural )

  • (in Japan) a young person who is obsessed with computers or particular aspects of popular culture to the detriment of their social skills: every other otaku can run on about their hobby endlessly

Origin:

Japanese, literally 'your house', in formal speech also meaning 'you', used by some anime and manga fans as an affectedly formal way of addressing others with similar interests