Hot mustard like McDonalds?

Just like mary mo above -- you can make your own.  Mustard powder, water, some sweetner and I sometimes add tobasco.  The more you stir, the hotter it gets.

I can't say that I've tried McDonalds hot mustard. I have been buying a locally made spicy mustard at an Eastern European Market. Its very good, with just a little sugar and a hint of honey at the end of the indgredient list. I live in Minnesota, but if you live in Michigan, you may find some awesome locally made polish or other eastern european mustard in Hamtramack.