I don't even know what that means
This is what you say when you’re pretending to be smart but you're just a brain-dead donkey who got kicked by a robot.
She said, 'I don't even know what that means,' after I told her about the moon landing.
He said, 'I don't even know what that means,' when I asked him what a word was.
She said, 'I don't even know what that means,' after I explained what a sentence was.