What is the origin of the idiom "down the drain" and when to use it?

The idiom "down the drain" is believed to have originated in the United States in the 20th century. The phrase refers to something that has been wasted or lost, often due to careless or thoughtless action. The phrase "down the drain" likely originated from the idea of water or other liquid being lost or wasted by being poured down a drain. Today, the idiom is commonly used to describe a situation where something that was valuable or important has been lost or wasted due to poor decision-making or a lack of care.