NSFW (Not Suitable for Work or Not Safe for Work) is an acronym, abbreviation or slang word which warns you that the URLs or hyperlinks which may be sexually explicit that is Not Suitable for Work.
NSFW is used to warn the recipient to not open the message at the office because the message contains sexual or repulsive content. NSFW warning is helpful potential embarrassment with their coworkers or supervisor.
Other less frequently used warnings which are similar to NSFW are
- PNSFW (Probably/Possibly Not Safe for Work)
- LSFW (Less Safe for Work)
- TSFW (Technically Safe for Work)
- PNFO (Probably Not for the Office)
Opposite of NSFW is SFW (safe for work)