Bad smelling gas and if you have terrible smelling bowel movements could indicate mucoid plaque being expelled. Have you notice anyhting darker than normal or hard and rubbery in your stool? I also have that something died smell from time to time and I have seen mucoid plaque. mucoid plaque is encrusted in the intestinal lining and then gets even thicker as more stuff adheres to it...yuck. In any case , it will smell absolutely horrible as I have found.