Definition & Meaning of "like kicking (dead|) whales down the beach"

What is the origin of the idiom "like kicking whales down the beach" and when to use it?

The idiom "like kicking whales down the beach" is an expression used to describe a pointless or futile activity. It is used to convey the idea of engaging in an action that serves no purpose or achieves no meaningful outcome. The origin of this idiom is not clear, but it is believed to have originated in the United States, possibly in the coastal regions.