Definition & Meaning of "pig-farmer"in English

What is the origin of the term "pig-farmer" and how is it used?

"Pig-farmer" is a slang insult that appeared in English in the 20th century, using the literal occupation of raising pigs as a metaphor for someone considered crude, rough, or socially low-class. The term emphasizes dirtiness, coarseness, or lack of refinement associated with farm work. It is used in informal, often mocking or hostile contexts, such as conversation, media, or casual writing, to express disdain or ridicule. The term is derogatory and intended to insult; it is never neutral.