how/what about that!
how about that
That is very interesting, impressive, 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!" How about that. Have you ever seen such a thing?
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
how/what about ˈthat (, then)!(informal) used for expressing surprise, praise, great respect, etc: ‘Have you heard Jane’s been offered a film part in Hollywood?’ ‘Well, how about that, then!’
Farlex Partner Idioms Dictionary © Farlex 2017