Souse [sows] n. Variety of and term for head cheese in the Pennsylvania Dutch dialect.
Souse is a variety of head cheese, usually specific to the Pennsylvania Dutch. They make their head cheese from the pickled meat of often otherwise unused animal parts (usually pork). These often include the feet, head, tongue, and heart.
The word itself probably comes from the Germanic souce, or pickling juice, which is related to sulza, or brine.