Maybe I’m naive and not up to all the new culture and stiff but I thought that term refers to the military. Maybe I’m missing something about the adultery and fornication reference.
It's become a widely-used abbreviation used by the hip-hop and rap "culture" to mean something that's very un-Christian. I don't even want to hint at what it means since it's crude and vulgar. If you're curious enough, just use a search engine using the phrase: "what does **** mean?".
And thanks to Servant of the Cross for having my back, from one prude to another. :-) By the way, the origin of that word, prude, nowadays used as a pejorative, is actually quite noble meaning "wise and prudent".