Generally a place for closet weeaboo and assholes, usually a combination of both, all the boards are complete shit and not worth looking at except for /b/ which has about 6 billion posts every half second.
Camwhores and other types of histrionic people come on so that they will become the next big meme or something, this, for the most part, fails.
It's also some sort of "Hacker Paradise" according to FOX News, what this actually means is, it has a large enough userbase to raid almost anyone and anything and people lacking enough social life to be able to spend time scouring the internet for personal information of said anyone.
Also it's anonymous, which uses the same tactic as the KKK in that if you disguise people, they lose their sense of indivuality and fear of being identified.
by semen_pants September 22, 2007
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A site where pretty much anybody can post anything.
I knew 4chan was not for me when I saw a picture of two teenage boys having sex. Jesus christ.
Tom: Hey, I was at 4chan yesterday and I saw some guy raping a goat.

Bob: Yeah, that sure sounds like 4chan.org to me
by FrownyFace August 14, 2009
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A meeting place and breeding site for the utter dregs of humanity. A festering polyp in the dieing colon of society.
my god, the people who go to 4chan would frighten even Charles Manson...
by jormungaund April 12, 2008
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If the internet was a human being. 4chan would be the ass.
4chan is very stupid, but funny, at times.
by monkeymandogthing April 20, 2010
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A shitty forum that has become wildly popular. It is full of child porn images and the origin of many of the shitty internet memes that seem to be oh so popular these days.
Person 1: Hey, did you see that picture of the naked 12 year old having sex with a rhino on 4chan yesterday?
Person 2: Oh yes, I did. She accidentally the whole thing!
by itsmeyay August 26, 2009
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A message board and image board on the Internet where people congregate to post various kinds of pictures, flash animations, and discuss things such as anime. It is the English version of the original Japanese board with a similar system: 2chan.

The system that 4chan uses is Anonymous, so one can safely post one's opinion without worrying. One can use a name and a tripcode (a # followed by a 'password') to gain 'status' on 4chan.
Did you see that insane Flash movie on 4chan?
by a_grilled_fish January 12, 2005
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A place made by satan with all his followers on the site. All of the stuff is fucked up and you don't want to see it.
guy1: hey what site did that guy post those j law nudes??
guy2: 4chan of course
by Rumsonfairhavenboi June 2, 2015
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