Blue streak

noun, slang

Definitions

Noun
  1. 1
    A great deal of fast talking, cursing, lying, or similar. informal

    "to talk a blue streak"

  2. 2
    A trace left by something that is too quick to see.

    "To pass[…] with such rapidity as not even to leave a ‘blue streak’ behind him"

Etymology

From the afterimage of a stroke of lightning, which looks like a blue streak across the sky.

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