IdiomThe AbsurdEnglish

talk a blue streak

Meaning: To talk fast and at length.

Example: “The tour guide talked a blue streak the whole bus ride.”

Origin: American, documented from around 1830, with an early recorded use in a Kentucky publication that same year. "Blue streak" for something extremely fast draws directly on the visual image of a lightning bolt — a flash of light and color moving faster than the eye can properly track, gone almost as soon as it appears. A less commonly cited rival theory instead points to the blue-tailed skink, a genuinely fast-moving lizard whose quick, darting motion reportedly left onlookers with little more than a blur of blue where its tail had been. Either image serves the same purpose: describing speech coming so rapidly and continuously that a listener can barely keep pace with it, exactly the way lightning or a fleeing lizard outpaces the eye.

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