blue streak

== English == === Etymology === From the afterimage of a stroke of lightning, which looks like a blue streak across the sky. === Noun === blue streak (informal, originally US) A great deal of fast talking, cursing, lying, or similar. to talk a blue streak A trace left by something that is too quick to see. === Further reading === “blue streak n.”, in Green’s Dictionary of Slang, Jonathon Green, 2016–present Grammarist