2weeks after doing mdma, my stools still have a foul smell, they float and have a mossy texture to them. also lighter than usual. what could it be?

No idea: stool may float just because of the amount of air in it, but bulky floating stools usually indicate a large amount of fat in them, which can indicate damage to the pancreas or other causes of fat malabsorption. However, I am not aware that MDMA has been reported to do this. However, Exstacy has so many other nasty and potentially dangerous effects (esp "Molly"), see your doctor, stop MDMA!!