What Is a Mouth Harp?

Bob Greene: I got a lot of people who guessed some type of mouth harp correctly. This noisy comes from a tiktok, which he found on the Reddit post link below. He then proceeds to create sound while smacking his mouth with his hand in the shape of the peace sign and eyes wildly rolling in his head. The noise was sent in by a listener named Claire Disten; check it out here.