Guffaw: Have a Hearty Laugh. Funniest App. Guffaw - What is that? noun: a loud and hearty laugh. verb: laugh loudly and heartily. A Fun App to Change Face and Voice. You are assured to have many hearty laugh once you use this App. Guffaw has many Face and Voice Changing Filters. You can also combine different Face effects to create your own. The possibilities are virtually endless. Go ahead and Download it Now. Available Features. Change Faces using Video Effects. Apply Multiple Face Filters. Record Videos. Change voice & Speed. Take Snap. Share Video / Photos with others. Videos / Photos automatically stored in the App.