Chibuku is a type of African fresh malted sorghum and maize beer with a shelf life of a week. It's now commercially made but is traditionally a cheap home brew. I remember seeing it long ago on Bizarre Foods as some hideous drink made in a clay jar and open fermented in a hut for a few days.
I bought chibuku in Zimbabwe when my curiosity was peaked at the grocery store. Our safari guide Justin laughed at my puchase and told me I wouldn't like it. He was right, but I'm still glad I tried it.
It is incredibly strange. Entirely unfiltered, you can feel the maize grit in every sip. The flavor is very sour with a lingering aftertaste. And it looks like muddy river water. The whole combination makes for an unappealing drink, but I still convinced our whole safari group to take a taste.
If you visit Zimbabwe, or another rural area in southern Africa, give it a whirl. The only thing I can think of that is similar is old style Peruvian chicha. We never found that in Peru, and modern chicha is more like a soft drink. Drinking chibuku is a totally unique African experience.