What is the origin of the idiom "roller coaster" and when to use it?

The idiom "roller coaster" takes its inspiration from the thrilling amusement park ride known for its sharp twists, steep climbs, and exhilarating drops. This ride offers an experience full of sudden, intense changes in motion, which is the source of the idiom's meaning. In a broader context, this expression is used to describe any situation or experience that involves significant ups and downs, sudden changes, or intense shifts in emotions, circumstances, or events.