Google describes the feature like this: "Express emotions and moods with sounds like applause, laughter, sad trombone ... Google introduced iMessage-like animated emoji to help users express ...

As much as I agree that The Emoji Movie is a crassly conceived, derivative, sloppily executed mess of a mediocre animated movie ... even a little sad. Because it also has a beautiful, timely ...

Google's Phone app now includes audio emoji, with options like sad, celebrate ... You'll even get an accompanying animation, so it seems like this is a feature meant to be used on speaker phone.