In some conversations on message boards, it is used in place of the word "random" to indicate that a post is off topic.

It may also be used to indicate that the content of a post is inappropriate for that board should be posted in /b/ instead.

This is due to the fact that "/b/" originates from the 4chan "random" board. the /b/ board is full of all manner of obscene madness that you wouldn't even see in sparta.
Poster 1: Which do you think is better- PS3 or Xbox 360?
Poster 2: My penis.
Poster 3: /b/
by crazfulla June 13, 2010
/b/ is not of substance, nor time, it is intangible and inperceivable; a paradox of existence. It is where the world's most powerful yet disturbed minds go to roam and contaminate. It is thought to be perceived as horrible even by its regulars, for it is. But to the dark minds that roam /b/, horrible is a mild value. /b/ is darker than Hell's deepest circle after the last ember has been extinguished. /b/ is where minds, dreams, hopes, sanity, innocence and morals die and inexplicable addiction festers.

/b/ is where Earth's darkest minds go to mingle amongst their own kind in a disorganized mess of offensive, random dialogue. /b/'s regulars have seen more gore, genitalia, insanity, racism and pure unfathomable random offensiveness than Zeus, the Greek god of lightning (and fornicating with mortals). In /b/, gore, genitalia, insanity, racism and pure unfathomable random offensiveness are tangible daggers that are incessantly flying around in a flurry of the darkest inner thoughts of world’s darkest minds giving the foundation of a ubiquitous gloom amongst the lost, innocent minds that wander ignorantly unto the realm. /b/ renders the most innocent minds cripplingly depressed and disturbed.
/b/ is the man urinating in the corner of a subway car.

/b/ is Jeffery Dahlmer.

/b/ is rape and murder.

/b/ is the way its minds see the world.

/b/ is only beginning.

Warning!!!: gut-wrenchingly horrifying, but this IS /b/. (NotSafeForAnywhere)>>>
Google:
4chan /b/
Man one: "Dude have you heard of /b/?"
Man two: "No, what is it?"
Man one: "Before I tell you, do you have people in your life who care about you?"
Man two: "Uh... yeah."
Man one: "Then never mind."
by /b/roken January 08, 2013
A cancer ridden hole that used to be a place where people could go post whatever they wanted to and say whatever they wanted to without persecution. It was once a dark place that most people refused to enter for fear of gore and child porn, a reputation the board earned within a few years of its creation due to there being no rules and very lax admins who just didn't seem to give a fuck. A place where people waged war against websites for socially normal people such as Facebook and 9Gag with internet raids and Denial Of Service attacks just for the fun of it. It was the most chaotic and fun board on the internet throughout most of the 00s.

Sadly that all changed just a few years back thanks to a group of legendary faggots known as Anonymous.

With the public recognition of Anonymous back in 2008 came the inevitable public recognition of /b/, with thousands looking up 4Chan to see where these new "heroes" had come from and what they saw did not please them. Almost all of these newcomers were disgusted by what they saw.

However instead of staying away from 4Chan like you'd expect these people to many of them stayed, flooding the board with tame and uninteresting posts that demoted this unique den of hatred and immorality as they tried their hardest to mold the board until it took the shape of any other regular internet message board and after 5 years they have succeeded.
Newfag:h3y wot is ur fav part about 4chon?!?!?!?!
Oldfag:4Chan stopped being interesting years ago along with /b/
Newfag:WOT U ON ABOUT 4CHAN IS VERY INTERSTING U FUKING FAG
OldFag:Not since Anonymous hit, now it's just like any other message board
Newfag:NO U R JUS LE EDGY HATER 3EDGY5ME U FUKIN FAG Y DON U JUS LEAF?
Oldfag:Isn't it past your bed time?
by Tuco_the_Ugly October 04, 2013
/b/ is the Random Image board of 4chan.
If you ever visit /b/, keep in mind that the materials there are for 18 and older.
Anyone else may be offended.
/b/ just makes me sick.
by raZor July 06, 2013
The Africa of the internet. Lifeless pedophiles go here for their daily dose of kiddie porn, hentai, and other unseeable things.
Went to /b/ today. OH GOD HELP ME UNSEE IT.
by InvisibleWater October 13, 2012
What you DO NOT talk about ( as mentioned in rules 1 & 2 of the internet).
Guy 1: Hey what's /b/?
Guy2: (punches guy 1 in the face) WHAT THE FUCK IS WRONG WITH YOU! YOU'RE NOT SUPPOSED TO TALKED ABOUT THAT!!!
by Guy on Urban Dictionary July 29, 2011
A collective of people that deflected from the normal course of life so severely, that they now live to make internet history. A collective of immature retards that's flaming skills are poor to the last degree. Boards that refuse to participate in their online charade of inanity are typically trolled by a few images of female genitalia, goatse, typical.
One day, a /b/tard wakes up, and with the feeble amount of brainpower he still has left, he musters up a thought, 'I fucked up.' It officially leads to what we like to call suicide.
by ThePlague September 02, 2006
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