Definition & Meaning of "pig-dog"in English

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

"Pig-dog" is a slang insult that likely appeared in English in the 20th century, combining "pig" and "dog" to describe someone as filthy, greedy, or morally contemptible. The metaphor links two animals associated with dirt, gluttony, or low behavior to a person's character, emphasizing repulsiveness or vice. It is used in informal, hostile, or humorous contexts, such as conversation, online forums, or satirical writing, to express strong disdain. The term is clearly derogatory and intended to insult; it is never neutral.