What say (one)?
1. What is one's opinion or input regarding what has just been mentioned, discussed, proposed, etc.? An old-fashioned construction reserved for very formal situations or for humorous or dramatic effect. A: "What say the council on this matter?" B: "We stand firmly opposed to it." So, what say you, Jonathan? Will you join our madcap adventure, or stay here in the drudgery of ordinary life?
2. Used to gauge interest in the possibility of one doing something. You know what, it's been a long week for everyone. What say we finish up for the day and go get pizza and beer, on me? What say I go get some Chinese takeout for dinner?
Inf. What did you say? (Widely used.) Tom: My coat is there on the chair. Could you hand it to me? Bob: What say? Tom (pointing): Could you hand me my coat? Sue: Here's your paper. Fred: What say? Sue (louder): Here is your newspaper!
See also: what