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64.
In Japan: an otaku is someone without a social life whatsoever and is an insult of the highest regard. There is a negative stigma associated to the phrase otherwise that involves a Japanese murderer who killed women because "they didn't have smooth faces like women in anime."
In America: a badge of honor worn by fans of anime, in lieu of simply calling themselves anime fans. Overused slang that has lost its meaning to many fanboys and fangirls.
In Japan: "With the amount of pornography that man buys, it's no wonder they consider him a disgusting otaku."
In America: "Dude, I love Sailor Moon and Utena because they have lesbians in it. I'm such an otaku! ^___^"
by Maikeru November 28, 2003
 
65.
Otaku is a person (typically male) who has absolutely no social life. Thus an otaku may sits around playing World of Warcraft, trading Dungeons and Dragons cards, watching Japanese animations, and jerking off while relishing pornographic material when he is alone. An otaku will be proud of, and will boast about his mighty forearm that developed over the many years of "over-masturbation".
Whilst leading a life of this sort, an Otaku will complain that no girls are willing to give him pussy.
WHYYYYY?????????????? Strange isn't it?
"Fuck, that otaku left cum stains on my sailor moon comic book!!"

"That guy's such an otaku. He plays WoW all day long and goes for a wank before sleeping."
by The Wok April 13, 2008
 
66.
Otaku is the Nihonjin (Japanese) word for Home. So an Otaku is Someone who prefers to stay at home, feeding their face w/ Poki and chatting, as opposed to going out and getting laid. Charicterized by their chubby (Fat ass) Appearence and untidy greasy hair, and bad hygene. Someone who'd rather get the dvd collection of Case closed, than buy new clothes. (You if you bothered to look this up)
"I'm an Otaku! Kawaiiiiiii!"

"Dude, you're such an otaku..."
by Hentaihentaiboy October 31, 2006
 
67.
If you wear a shirt that says "Otaku" with the kanji script above it, and you are an american, you are an idiot.

Otaku is not something someone strives to be, nor is it a good thing. Americans, and I suppose other non-Japanese, do not understand the truth to this phrase.
I hate those posers who walk around in Otaku shirts.
by toee May 17, 2006
 
68.
A Japanese word, basically the equivalent of 'loser'.

Many Western anime/manga fans use it as a positive term for themselves, even though it is in fact negative.

However, there are people who know its correct use but are proud of being one anyway; just as some people are proud to call themselves 'losers'.
"Put that manga down and go outside, you otaku!"
by Ami April 17, 2004
 
69.
Japanese for "zealot" or "fanatic". Most common with those who are fanatics of popular (dubbed) anime shows. It is also used to describe said fanatics who go to the point of imitating EVERYTHING that relates to Japanese culture.
When going to college, beware of the otaku nerds who will rant about which episode of Pokemon or Dragonball-Z was better.
by AYB February 10, 2003
 
70.
1. An American term that is used to denote a zealous fan, usually of anime,manga and video games.

2. Refers to someone who has a devotion to a subject or hobby (not necessarily anime) to the point of not leaving home.

3. Some one who social skills have atrophied or never even developed, due to their manic involvement in their chosen fandom.
That kid is so Øtakü. He won't leave the basement unless it's to eat.
by morepowerr January 10, 2008