NSFL also known as NLS means Not Safe For Life or Not Life Safe normally referring to a link someone or some website has sent you meaning no one should ever see it.
by Kelby Raper January 27, 2008
Get the NSFLmug. Not Safe For Lunch. A warning that linked content is sufficiently horrendous as to be sensibly avoided by the weak of stomach.
by Morosoph January 22, 2009
Get the NSFLmug.