The drama over the use of "spastic" in a Weird Al song caused me to find out that the term has, not two, but three distinct regional senses: Generic insult roughly like "klutz", not particularly offensive. (Most American English.) Highly-0ffensive slur for people with particular disorders. (UK English.) Emotionally-neutral medical term for those disorders. (India.) I mentioned this to a friend, who mentioned having once used a word which was mildly-insulting in American English, and extremely insulting in Australian, like, "grounds for physical violence" levels of insulting. And now I'm nervous because I can't think of one of those and wonder what it is and whether I'm likely to hit it.