4chan is the nexus of the internet, where everything goes to live and die. Especially famous for begetting the rickroll, SHOOP DA WOOP, and lolcats.

The most famous board is certainly /b/, the random board. After that probably comes /a/, the anime board, and then maybe /v/, the video games board.

...See Encyclopedia Dramatica for where much of 4chan goes to die.
I went on 4chan yesterday, I'm pretty sure that my brain fell out.
by Rowan K April 17, 2008
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4Chan is, as many would say, the asshole of the internet.

Aside from this, 4Chan is also where every meme ever came from. Many of the things on 4Chan are horrible things (such as goatse). The very few gems that are actually funny make their way to other places on the internet.

This site is home to many Trolls, who use things like goatse and /That Series/ ("Of Warlords and Pleasures"), and other things that cannot be unseen to terrorize other sites through obscene spam. Most of these things are on /b/, which is basically the armory for Trolls. I recommend that, if you feel the urge to visit 4Chan, you leave any religious beliefs, morals and etcetera behind. Also, please make sure there is nothing nearby for you to kill yourself with, becaue you /will/ lose all hope.

Much like the Fight Club, you do not talk about 4Chan. Not ever.
Guy1: What's 4Chan?

Guy2: The asshole of the 'net.

Guy1: What?

Guy2: You really don't want to know, trust me.

Guy1: Yes, I do.

Guy2: Okay then... *brings up 4Chan on laptop*

Guy1: OhmyfuckingGodkillit! No, wait, kill me! There is no hope!
by Al Golston November 19, 2011
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A shitty site for closet homosexuals with no social life with nothing else than anime, gay porn, spam, retarded threads like "rate my (micro)cock", "need advice about <whatever>", "I hate jews and <whatever>".
Whoever wrote the first definition must have been on crack.
4chan sucks like hell but at least it keeps asshole trolls busy.
by Phoenix777 August 2, 2008
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Possibly the end of the internet, or source, or center, or beginning. Everything you can ever think of is found here, whether you want it to be or not. This website is slowly dominating pop culture and the world. Several rules are often followed when entering 4chan (they are the rules of the internet, unsurprisingly invented for, at, and by 4chan):

1. Do not talk about /b/.
2. DO NOT talk about /b/.
3. We are Anonymous.
34. There is porn of it, no exceptions.

These people are the society of the nobodies. They are the middle generation, born to go nowhere and do nothing with their lives. Their form of therapy? 4chan.
1 - "So my good friend told me about this website he goes to. It's called 4chan or something."
2 - "You poor soul."
by Mr. Awesome Guy October 17, 2009
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An unfunny website catering to children and 16-25 year old's who are under the illusion that they are edgy, witty, funny or any combination of the three. Humour on the site is comprised of using inside jokes that have died out and beating them to death with the hope of making them funny again (keep in mine most of them weren't funny in the first place). The site was at it's peak during the year of 2006 but recently it has been a home to scene kids and retards who use the words "epic", "win" and "fail" excessively, deteriorating the quality the site used to be known for. It's Random board, the worst offender of everything outlined here, was the home to many intelligent users and humourous people who have now fled to sites like SomethingAwful and 7chan to escape the wave of mediocrity.
Former 4chan visitor: Hey how's it going?

2007 onward 4chan visitor: LOL EPIC WINZ LULZ LULZ FAIL CANDLEJACK EPIC FAILZ NIGERZ NEWFAG LOL RICKROLL AM I KEWL AND EDGY YET?

Former 4chan visitor: ...
by John Brown King of The Burbz September 27, 2009
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a piece of garbage, also a piece of trash. Frequented by idiots. Maintained by fags. It's members feel they have figured out the meaning of life, claiming they are humanity in it's purest form, (see bullfuck ) when a two year old on crack has a better philosophy on the human condition. They use these stupid meme things, that make no sense whatsoever and anyone with a half a string (see string theory ) of an electron of an atom of a braincell in their head, wouldn't find them funny in the least and laughing at them is usually done to improve ones own rep. On the site itself, questionable material is posted anonymously (corpses, kiddy porn, homocides) and the folks over at 4chan join together in a hearty laugh, because they're so ruthless and uncaring (yeah sure). They are all about as assimilated as a scientologist mudkip being bel-air'd in the fort-harrison hotel, hooked up to over 9000! e-meters. That is 4chan in it's purest form.

F. A. Got: Say John, did you check out 4chan yet?
John: No, why would I go there? That's where ALL the fags are.
F. A. Got: Listen just divide by zero and longcat is lon...
John: *shoots Mr. Got*
F. A. Got: Yoooo killed mi!
John: One down, a legion to go.

by Iron Chancellor March 1, 2008
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Based from my opinion and knowledge
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4chan is a website which has been call
as "Butthole of internet" or what i call it as
"A internet blackhole"
since you can barely see anything from this website
from simple board like greentext which is about people using > in their text to told wtf ever they want
since > will affect to make their text grren(?)
to an "Hell" Like seeing people get raped or gore shit or idk(?)

you can see cool people in 4chan
but most of the time they just an butthole since they anon(ymous)
but sometimes they are really a good guy
like one time some douchebag just post about "Abusing his cat" which crossed one of a mighty rule of 4chan which is that
"They love cat and they cant stand which animal abusing espically cat"
which end up he got exposed by 4chan user and been kick straigh right to jail

and many more legend moment
like "Tumblr vs 4chan"
which i will explain tumblr later
but simply tumblr is just like 4chan but sfw(?) and contain "A LOT" of woman and feminist
which in that war
tumblr feminist and 4chan user open a war using a meme that against 2 webaite
which end up 4chan win
and tumblr probably learn it lesson
------------------------------------

Short describe:
4chan is a website contain cool people and shithole people

(mostly shithole)
but as we all know anything had it own darksite
that it for today!
have a nice travel in this big world of internet :)
-Chingchongboii
Man: Hey fella check this out
fella: what?
Man: It a website call 4chan
fella: *ptsd*
by chingchongboiiii February 16, 2023
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