Wiktionary
know what
phr. (alternative form of you know what English)
Usage examples of "know what".
Henry didn't know what Flib was, but the unie certainly seemed to be bothered, even terrified, of it.
Plus, if you don't know what program to associate a file with, there's a nice hyperlink included in the dialog to take you to a helpful Microsoft Web page.
I didn't even know what building I occupied, but then, no building offered real cover.