Just now with Lily:
Lily: Mommy, what does what mean?
Me, not sure I’d heard correctly: What?
Me: yes what?
Lily: yes. what.
Lily: What does what mean?
Me: the word “what?”
Me: It means “sorry, I didn’t hear that” when you use it that way.
Lily dances off, happy. I think, “I’m headed for the blog with this one.”