The full form of NSFL is Not Safe For Life
NSFL stands for “Not Safe For Life”.

The slang term to describe something that is “not safe for life”. Any situation or image that could cause an irreversible scarring to a person’s mind, fall under the category of “not safe for life”. In instances of websites the slang term is placed to show that the site is probably something a person should think twice about visiting. This is also the term used to show that a site holds pornographic material as well as disgusting or even terrifying images. The term can also be translated into “not safe for lunch” to explain that the potential food is far beyond horrendous and should not be consumed by people.

When a website has this term in the description it might be best to just take a pass and move on down the line. Things that are “not safe for life” could leave you scarred for life and wishing you had never peeked inside.

Origin of NSFL
This slang term originated on a website that founded in 2005 based on a webcomic. The usage of the term USFW (Not Safe for work) took the internet forums by leaps and bounds. In a society that saw a need to camouflage language and images so that they concealed from school children saw the birth of this family of slang terms.

Those thoughts helped to launch the acronym that helped identify ‘nsfl’ soon became the go-to term signifying adult content on websites. Ironically, the creation of the term ‘nsfl’ started as a label for things far beyond the realm of NSFW. Those images and content that were so appalling or atrocious that the milder version was not enough to describe.