I grew up in Solo, a region wellknown as an ultra-polite javanese, beside Yogya. I use to speak in polite java language to everyone.
The time I had to go to college, I had to live in Semarang. This is also a javanese region, but with more complicated people. Many people from other origins, from Sumatera, Kalimantan, and other islands.
My first impression was, the javanese language here is lil rough. My ears sometimes got itchy hearing it.
Especially among students, ooogh, so bad.
I remember a comment that a friend said, has make me completly dazed and speechless for a while. We were talking about an annoying professor. I was upset too, but to hear what my friend said has really shocked me.
He said, "dosene utege njeblug". In English: The proffessor's brain has blown up.
1. It's so impolite to say so about a professor
2. It's about the feel. You who don't know javanese language may not be able to feel it. 'uteg' is 'brain', but usually used for animals.
I thought (and still think) it was really foul.
I've been living in Semarang for over ten years now. My ears get used to hear foul words. But I try to keep myself, not to use them in my daily conversation.