"a snowball's chance in hell"의 정의 및 의미

What is the origin of the idiom "a snowball's chance in hell" and when to use it?

The phrase "a snowball's chance in hell" is an idiom used to describe a situation where something has virtually no chance of success or survival. The origin of this phrase can be traced back to the idea that a snowball would quickly melt in the extreme heat of hell, emphasizing the extreme improbability of success in unfavorable circumstances.