how about that, then

how about that, then

That is very interesting, impressive, exciting, surprising, or respectable. Said as an exclamation, rather than a question. A: "I heard Janet is running for local government." B: "Wow, how about that, then!" How about that, then. Have you ever seen such a thing?
See also: how
Farlex Dictionary of Idioms.
See also:
  • hoo-rah
  • atcha
  • back at you
  • back atcha
  • ah
  • be still my beating heart
  • be still my heart
  • manual