Beer potomania is a big word that can be hard to understand, but it basically means that drinking too much beer can make you very sick.
You know how your body needs certain things to stay healthy, like food and water? Well, it also needs something called electrolytes to work properly. Electrolytes are special things in your body that help your muscles and nerves work the right way.
When people drink a lot of beer, their body gets too much water and not enough of these important electrolytes. This can be bad for your body because it can make you feel dizzy, confused, and even make you pass out or have seizures.
So, drinking too much beer can be dangerous and is definitely not a good thing to do. Remember to always drink responsibly and in moderation!