Oh, any minute now someone will pop in with a full-blown explanation of what karma really is. In anticipation, I shall only say this: language evolves, words take on new meanings, blah blah blah. It is why English is such a rich language, so grood.
Just don't tell that to the French-- those dumbasses try to legislate it so that language doesn't evolve, not quite understanding that it will regardless. 'Tis the way of memes.