Definice a Význam "[swear|curse] a blue streak"

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

The idiom "swear a blue streak" originated from the idea of using profanity or vulgar language with such intensity and rapidity that it creates the impression of a continuous stream of blue (vulgar) language. Figuratively, it is used to refer to the act of expressing extreme anger, frustration, or annoyance by using a rapid and continuous string of curse words.