That wouldn't be possible in any real sense. You could explain it in the literal sense: a way for the body to detect mechanical waves created by the world around them and use those to better assess the environment. Still that wouldn't really cause them to understand. The same goes with any sense.
it's something that gives meaning to your ears (these things, pointing at my ears). Noises around you should stimulate the senses in your ear and causes a feeling and effect. You're supposed to receive messages with your ears when someone makes noise with their mouth, but you will never experience it until technology and science has more funds.