NSFS
"Not Safe For Straights", a tag mostly used on twitter by gay people, used during and before Pride Month, users are not allowed to post any straight content under their tweets, or the kpop stans will go after you.

It started as a mockery of "Not Safe For Ramadan", but is now widely used across twitter and is now yearly occurrences.
Yo not cool bro my name says right there (NSFS), why are you replying with men fucking pussies on my tweets?