What is the origin of the idiom "talk a blue streak" and when to use it?

The origin of the phrase "talk a blue streak" is uncertain, but it likely stems from the association of the color blue with intensity, speed, and vividness. The term emphasizes the rapid and continuous flow of speech, suggesting a level of enthusiasm or urgency. It is used to describe individuals who speak rapidly and energetically, often without pausing or hesitation. This idiom conveys the idea of someone talking animatedly, possibly overwhelming or captivating their listeners with their rapid-fire conversation style.