something moving very fast:
They traveled like a blue streak through Italy.
continuous, rapid, or interminable speech:
to talk a blue streak.
blue streak, a
a composite garden plant, Catananche caerulea, of southern Europe, having very hairy leaves and blue flower heads, used by the ancients as a love potion.
an edible Australian crab, Portunus pelagicus. noun an edible bluish Australian swimming crab, Portunus pelagicus (Austral, informal) an Australian ten-dollar note
blueweed (def 1).