I'm not a native speaker and was wondering what exactly does "lowest common denominator" mean? I was always under the impression that it referred to something base that is shared by the largest amount of people, like sexual urges, envy, greed etc. So if somebody said: "the show is targeted at the lowest common denominator" I took it to mean that it caters to these primitive universal tendencies. But lately I have seen it used as an insult or basically a verbose way to say that someone is stupid. I never thought that the phrase was meant to refer to actual people and tend to see it as a misuse, but found out that according to some online dictionaries, this usage is correct. So how is it?