What is the origin of the idiom "move one's ass" and when to use it?

The idiom "move one's ass" originated as a colloquial expression in American English. It emerged in the mid-20th century and gained popularity as a direct and assertive way to urge someone to take action or hurry up. This expression can be heard in various situations, such as when urging someone to complete a task quickly, encouraging swift decision-making, or prompting someone to move faster physically.