What is A Cup Of Shut The Fuck Up?
Something you offer to a person who cannot get the hint that it is time to stop talking.
She: "... and then she said that we could go shopping at the mall. And so I said, that sounds like a good idea. So she drove us there, but then we could not find a place to park so we decided to go get something to eat..."
He: "Excuse me, would you like a cup of shut the fuck up?"