Listen to the sound clip Duffman from Duffman Soundboard: Duffman Duffman This sound is from Duffman Soundboard Duffman is a popular character from the animated television show The Simpsons, known for his catchphrase "Oh Yeah!" This exuberant sound is often heard when Duffman makes his grand entrance, promoting Duff Beer with his e… Go to the full soundboardwith more sound clips Search