Not safe for work
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Not safe for work, not work-safe (NWS), not school-safe (NSS), not suitable for school or work (NSSW), or not for British school kids (NFBSK) is Internet slang or shorthand. Typically, the NSFW tag is used on interactive discussion areas (such as internet forums, blogs, and community websites) to mark URLs or hyperlinks that may be sexually explicit or includes audio that contains profanity, so that the reader can avoid content that may be objectionable. NSFW has particular relevance for individuals making personal use of the Internet at workplaces or schools that have policies prohibiting access, even inadvertently, of sexually explicit images. Companies and universities frequently adopt such policies because they regard the presence of sexually explicit images as a misuse of company property (or education resources) and, potentially, a violation of sexual harassment policy.
Determining a site to be NSFW can be subjective in some cases. The less frequently used warnings PNSFW (Probably/Possibly Not Safe For Work) and LSFW (Less Safe For Work) are sometimes used to indicate content that may be considered salacious by particularly strict censors, such as images of underwear models or a news story about sexual issues that does not contain explicit images. NSFW is also sometimes used to refer to any media that produces sound, such as a game or video file, the implication being that the noises may alert others in the vicinity that the user is viewing entertainment materials instead of working.
NSFW is often sarcastically used, under the same circumstances, as a meaning for "Now Show Friends and Workmates."
Superseding NWS are the acronyms NLS and, on the Something Awful Forums, NMS which stand for Not Life Safe and Not Mind Safe, respectively. These are typically used when referring to internet shock sites or other highly grotesque material.