What is the origin of the idiom "thin as a yard of pump water" and when to use it?

The idiom "thin as a yard of pump water" is a colloquial expression that originated as a vivid and humorous way to describe extreme thinness. The exact origin of the phrase is unclear, but it likely developed as a creative and exaggerated comparison. it is used to describe someone who is extremely thin. It suggests that the person is so thin that they resemble the thin stream of water from a faucet. The phrase emphasizes the person's lack of body mass and implies a very skinny or gaunt appearance.