If you look up the seven words(which I won't repeat here), it's certainly not words we use around here regularly, with the exception of maybe sh*t when we say BS. My theory is that PJ's daily DU funnies that quote some of the bad words on DU are skewing our results.
If they are including historical results in the analysis. I do remember that around Sept 11 some freepers got very, very angry and did post a lot of bad language. And the mods just let it go. Just check the threads from those days.