[livingparadox]

It stands for "Social Justice Warriors".

This originally meant someone standing up for minorities and the disadvantaged, but the term has been twisted into a derogatory insult for anyone who disagrees with conservatives on social issues.

[fooqux]

The SJW term, like everything else touching this issue, is not black and white. Both of your definitions exist, yes, but so does everything else in between. By making things black and white, you are perpetuating the exact same behavior you seem to be fighting against.