Definition & Meaning of "piece of crap"in English

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

"Piece of crap" is a slang insult that appeared in English in the 20th century, using the metaphor of feces to describe a person as worthless, incompetent, or contemptible. The phrase emphasizes strong dislike or disdain, equating the person's character or actions with something physically repulsive. It is used in informal, often hostile or humorous contexts, such as conversation, media, or online posts, to express contempt or insult. The term is clearly derogatory and intended to demean; it is never neutral.