1. Otaku is a Japanese word for house. 2. Refers to someone who has a devotion to a subject or hobby (not necessarily anime) to the point of not leaving home.
Who is that guy??? I really loves Jessica Alba, is he an otaku?
Oh my god, AnimeCon is coming to town, let the otakus see daylight.
For me, otakus are crazy anime and manga people who cosplay/obsess over Japanese culture. They collect Pokemon, Yugioh cards and even play geek stuff like Magic cards. So yes it extends to more than just Asian things. They're White, Black, Asian anyone who is overly obsessed!