NSFW stands for Not Safe For Work so a NSFW comic is probably
one that contains adult material
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NSFW = Not Safe For Work = Pas Sûr Pour le Travail.
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NSFW:
-Not Safe For Work.
-Not Suitable For Work.
In general, if you were to get caught looking at this material
in the workplace, it would be extremely looked down upon. NSFW
usually contains graphic material and nudity.