there are several definitions of "otaku"

1) polite(correct) way of saying house
2) many people mistake the actual definiton of otaku when it comes to things such as "anime otaku" or "game otaku"
it used to be a insult but recently, the definition has changed to a more positive meaning, although the word can still be used as a insult, it is more commonly used as a compliment
Ex. anata wa computer otaku desu ne (your a computer otaku)

although it is unclear as to when the definition switched, many believe that it may have happened with popularity of animes and mangas going up

manga otaku
electronic otaku
anime otaku
by fforigens0 March 14, 2009

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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

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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

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A disease started in Japan caused by "Anime" there are many stages and side effects, if one consumes to mach of this so called "Anime", they may be vulnerable to an even WORSE disease called "Weeaboo".

Side effects may include, Speaking Japanese, Obsessing over fictional characters, shipping fictional characters, spending a large amount of time starring at a screen, and becoming mentally depressed for 24 hours every time you finish an "Anime".
"Yo, check out that guy, I think he's suffering from Otaku"
by xXFandom_PrincessXx November 17, 2016

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Basically Japanese for "nerd".

It has been adopted as a description by many anime fans who are either too retarded to realize it's an insult or are so obsessed with Japanese culture that being called a Japanese word is great no matter the meaning. These sub-categories of anime fandom need to get a proper education and get a life, respectively.
I'm so otaku >.< :D :D :D

Shut the fuck up you retarded piece of shit. Otaku is a fucking insult, okay? Learn to read and maybe you'll figure out these "complicated" definitions. Fucking illiterate bastard.
by Brodo_Swaggins October 22, 2016

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A Japanese slang word for someone who devotes so much of their time to a particular activity that it is detrimental to their social status; a nerd.
"What an otaku; sitting at home always playing Starcraft."
by The Legend Never Dies August 08, 2013

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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

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