Google Fingers
The sound someone makes when you ask them a question and you hear them immediately look up the answer online while you are still talking to them.
"I just asked Melissa what the capital of Assyria was, and I heard the sound of Google Fingers coming from the other end of the phone."
Google finger theorem
The concept that artificial intelligence like that used in self driving cars and other autonomous machines will never be fully integrated into everyday life until they can interpret human nonverbal communication in the appropriate context.
When I give a self driving car the finger and it reacts appropriately, I will know the technology is ready for prime time. This is the Google finger theorem in practice.