No, there is no real substance called "bismullah." It is a made-up word. There are a few possible origins of this word. One possibility is that it may be a mispronunciation of the French word "bis petit," which means "twice as small." Another possibility is that it may be a combination of the words "bismuth" and "Allah." Bismuth is an element on the periodic table and Allah is the Arabic word for God. So, bismullah could mean something like "God's element."