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1.
CNBU stand for "Can Not Be Unseen", the purpose being to distinguish between that which is appealing and NSFW and that which is disturbing/grotesque/just plain wrong.

"How does this affect me?" you ask. In short:
Good NSFW remains NSFW; bad NSFW turns into CNBU.
Goatse is now CNBU... unless you're into that sort of thing.
by rddt May 08, 2010

Words related to CNBU

nsfw
 
2.
Can Not Be Unseen
Good NSFW == NSFW; Bad NSFW == CNBU
by Miko Jack May 08, 2010