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Phrase(s): What do you know?
Inf. a typical inquiry on greeting someone. (A specific answer is not expected. Often pronounced "Wha-da-ya know?") • Bob: Hey, Tom! What do you know? Tom: Look who’s here! Hi, Bob! • John: What do you know? Mary: Nothing. How are you? John: Okay., Phrase(s): What do you know (about that)?
Inf. That is very interesting. • Tom: I heard that Jim and Mary are getting married. Jane: Well! What do you know about that? • What do you know? Bill finally sold his house!, Phrase(s): (Well,) what do you know!
Inf. a way of expressing surprise at finding something that is unexpected; an expression of mild surprise at something someone has said. (No answer is expected or desired.) • Andy: Well, what do you know! Here’s a brand new shirt in this old trunk. Bob: I wonder how it got there. • Tom: These two things fit together like this. John: Well, what do you know!
McGrawhill's American Idioms And Phrasal Verbs
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What a surprise, as in What do you know, our suitcases are the first off the plane. [Early 1900s]
American Heritage Idioms