how about that
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how about that(, then)
Used to indicate that one finds something to be very interesting, exciting, surprising, or respectable. Said as an exclamation, rather than a question. A: "I heard Janet is running for a seat in the Senate." B: "Wow, how about that!" Well, how about that—the government actually passed a tax bill that the majority of Americans support!
See also: how
how about that
Informal Used rhetorically to express surprise or wonder at or approval for something.