Definition & Meaning of "peehole"in English

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

"Peehole" is a slang insult that likely appeared in English in the late 20th century, using the literal image of the urinary opening as a metaphor for someone contemptible or worthless. The term emphasizes disgust and humiliation by equating a person with something physically repulsive. It is used in informal, often hostile or mocking contexts, such as conversation, online forums, or casual writing, to express strong disdain. The term is clearly derogatory and intended to insult; it is never neutral.