Definition
A thunder mug is a slang term for a chamberpot, often made of earthenware or metal. It's basically a fancy nickname for a portable toilet used before indoor plumbing was common. The 'thunder' part likely refers to the sound it might make when something is deposited into it. 😆 Thunder mugs are a relic of the past, representing a time before flush toilets. They were essential for nighttime convenience. They're now mostly found in antique shops or historical museums.