Definition & Meaning of "piece of trash"in English

What is the origin of the term "piece of trash" and how is it used?

"Piece of trash" is a slang insult that appeared in English in the 20th century, using the metaphor of refuse to describe a person as worthless, contemptible, or morally bad. The phrase equates a person's character or actions with something discarded and undesirable. It is used in informal, often hostile or mocking contexts, such as conversation, media, or online posts, to express strong disdain. The term is clearly derogatory and intended to insult; it is never neutral.