What is the date? (used to request the current date)

(idiomatic) Used to indicate agreement, as if one would have wanted to say what a previous speaker has said, without change or qualification

(now formal) What is your opinion? What do you say?

(idiomatic, US) As an interrogatory, indicative of a nonchalant attitude towards potential criticism, not caring about what other people think, confident and self-possessed.

Alternative form of think of the children

(rhetorical question) What is the delay? Why are you not acting or proceeding?

Alternative form of which foot the shoe is on

(dated) whatchamacallit

The name of something the speaker does not want to mention, but which is known, or very likely to be known, to the listener. It can be plural (as in "... the you-know-whats").

(idiomatic) A phrase used to get someone's attention before announcing something.