Wiktionary
phr. (context idiomatic colloquial English) What did you say?; huh?; (non-gloss definition: expresses incredulity).
Wikipedia
"Say What" is a single by LL Cool J from the hip-hop compilation, Violator: The Album. It was released on August 3, 1999 for Violator Records and Def Jam Recordings and featured production from Vinnie Biggs. In addition to Violator: The Album, Say What would also make an appearance on the soundtrack to LL's movie, Deep Blue Sea.
Say What may refer to:
Usage examples of "say what".
Look at a meeting-house, or a court-house, or a jail, or a shop, or a dwelling-house, and say what that thing really is before a true gaze, and they would all go to pieces in your account of them.
It is not up to our young grandchildren to say what in our life's experiences might be useful or enlightening to them?
So cunningly did Conrad contrive that situation, with its inextricable mingling of concrete right and abstract wrong, that no man can say what he would have done, had he been in Lord Jim's place.