"Not Safe For Kids"
-Abbreviation used to describe any kind of media content/material (filled with violence, sex, nudity, and crude language) not suitable for children or teenagers to view.
Daddy Cado: Did you see Borat?
Mommy Pam: Yeah, of course!
Mommy Diana: How was it?
Mommy Pam: It was good. I had a nice laugh but that shit was so NSFK. I will never allow my kids to see it.