SWEARWORD - A popular term for a word or phrase that is obscene, abusive, and socially offensive.
For some reason, all of them seem to be associated with excrements, sex and religion. This question is specific about offenses, not intensifiers. Can you identify any that doesn't follow the rule and tell when and where it originated?
I don't mean mild offenses like "dumb", "idiot", "jackass", "blockhead" or the like, but words or phrases that will shock those who overhear them.
EDIT - It seems my question has been misunderstood by some. I'm looking for swearwords that are not related to excrements, sex or religion, and still might shock someone. I don't expect a list because I believe they are few, and some of them have already been mentioned in the answers below. If I find them together in one answer and there is some reference as to where and when each one originated, I'll accept that answer.
ps. Of course, whether or not we find a word shocking or offensive largely depends on where (and how) we have been brought up, our educational background and elements of culture. I would therefore consider the average man (average income, age, education) as a reference.