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/
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