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1.
Not safe for Mind. When something is so retarded that the usual facepalm is not enough to express the extreme disappoinment and frustration.
Finally the new Bieber's song is out!" *posts link* "Jeez spoiler that crap, it's NSFM!
od uživatele ixigia:face: 05. Listopad 2010
 
2.
No safe for minors. Pretty much self-explanatory.
"That site has too much nasty content, it's nsfm."
od uživatele Iwakura Lain 19. Září 2005
 
3.
Not safe for Muppets; An outfit or a picture that would get banned on Sesame Street after Katy Perry was censored for her cleavage in her duet with Elmo.
Your Facebook profile pic is NSFM, too much boobage!
That top is so NSFM, I can practically see nipple!
od uživatele Rockstalker 24. Září 2010
 
4.
The NSFM tag originated in Reddit's /r/trees community of marijuana lovers. It means the post is Not Safe For Munchies, so you should avoid looking if you don't want to be hungry.
Man, you should have tagged that picture of pancakes as NSFM!
od uživatele LivingDeadInside 02. Červenec 2014
 
5.
Not Safe For Mom. It might be safe for work, but you don't want your mom reading it -- especially if it's on your blog.
Should I post this link to College Humor? I wouldn't say it's NSFW, but it's probably NSFM.
od uživatele underscorebleach 28. Listopad 2006