Hog waller is a term that is commonly used to describe a muddy, dirty area in which hogs roll around. This term is often used in rural areas where pigs are raised and is considered a slang term. However, there are several other synonyms that can be used instead of the term "hog waller." Some of these synonyms include pigsty, pigpen, swine wallow, and mudhole. These terms are also used to describe an area where pigs or other animals roll around in the mud. While these terms may differ in usage and context, they all describe a dirty area where animals enjoy rolling around and getting dirty.