Definition & Meaning of "all {one's} Christmases [have] come at once"

What is the origin of the idiom "all one's Christmases have come at once" and when to use it?

The exact origin of the idiom "all one's Christmases have come at once" is unclear. However, it likely stems from the cultural significance of Christmas as a time of joy, generosity, and the exchange of gifts. This phrase signifies a moment when all of one's desires or dreams are fulfilled simultaneously. It is commonly used to describe unexpected and significant positive events or outcomes that bring immense joy, similar to receiving multiple gifts on Christmas Day.