Today I was talking to some native Russian speaking girls that I tutor and they asked me if I knew any swear words. And of course the first one that popped into my head from my Dictionary of Russian Obscenities was "Соси мой ***." And when I said this they were really surprised and told me to never say that. I couldn't tell if they were surprised because I knew it or because it was that bad. Keep in mind that these girls are in highschool so I wasn't talking to like a 5 year old.
So how bad is it?