Someone who is obbsessed, and has no life outside of their obbsession. It's an insult in Japan. Mostly said like "anime otaku". Someone who is obbsessed with Japanese animation.
Not all otaku are bad.
by C-chan November 06, 2003
One who obsesses about something or someone to an unhealthy extent, sacraficing most, if not all, of their social life.

Often used (incorrectly) by American anime fans as a trendy term to describe themselves.
Correct usage: anata wa otaku desu. (You are a nerd.)

Incorrect usage: I like anime, so I'm an otaku. (This is, however, correct if the person saying it has no life outside of anime.)
by Nosferatu June 20, 2003
1. A person who is a big fan of anime.

2. An anime fanboy or fangirl.
Person 1: "Are you an otaku?"
Person 2: "Yes."
by TheAnimeLover1 October 17, 2014
In Japan, the term OTAKU is normally deragatory, meant as an insult. It basically means 'lifeless loser who never leaves their house'.
In America and Canada, though, it is used to refer to anime/manga fans and sometimes video gamers. It is used to refer to somebody as a geek, opposed to a loser, and is not a deragatory meaning.
So it is important that if you go to Japan that you do not use the word without clearly stating what you mean.
Canadian: I could tell you ANYTHING about anime!
American: You are such an Otaku!
Candian: I know, right!
Japanese: Canadains and Americans are a little...odd...
by in-the-stars February 28, 2009
A person who spends most of his/her life watching anime, reading manga, playing video games, staying up on the computer and the such.
Most people would say that an Otaku would have no social life except for online communications.

B. The Japanese word for "House"
A.
Samantha: *types furiously without looking at keyboard and playing an MMO*
Elizabeth: *waiting for samantha to pick up phone*
Samantha: *talks to herself* "Sooorrryy Elizabeth, i'm kinda busy here!!! *says to self*: right-left-SPACEBAR!!! SPACEBAR!!! JUMP!! JUMP!! NOOO!!!! *still talking to self*: Yeah thanks a lot Elizabeth! You ruined my whole frikin game!
Elizabeth: *leaves a voice message* -sigh- Samantha, you're such an Otaku.

B.
Joe: I'm moving into an Otaku in Japan and going to college there next year.

Bob: You're moving into a crazed computer freak?!?!

Joe: -_-'
by SamanthaTehPwner July 10, 2008
a 12 year old that watches Bleach and Naruto and thinks they are completely immersed in japanese culture. See Weeaboo
Bob: I know all about japan because I watch Naruto!
Bill: no u are a weeaboo
Bob: No I'm otaku and proud
by sylveon November 24, 2013
Originally a Japanese term for "your house," "otaku" now refers to that bizarre suubculture that is obsessed with Japanese culture.

At least, that's what the otaku themselves would see it as. In reality they are a group of weirdoes so socially inept and obnoxious that other weirdoes cross the street to avoid them (on the rare occasions the otaku ventures outside). They really only like manga and anime, and seem to think that reading a comic or watching a TV cartoon originally intended for Japanese infant school students while wearing a too-tight shirt with random kanji characters emblzoned on it makes them a venerable Eastern sage.

The otaku believes that millennia of Japanese history, art and philosophy is irrelevant compared to a comic about bug-eyed schoolgirls battling robot space ninja goblins.
Otaku: "Worthless peasant gaijin! My weird enjoyment of comics that were written for children, despite the fact that I am a pasty grown man, means that my wisdom far outstrips yours! Can you smell sweat?"
by Muttering Master March 06, 2007
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