Drew and I have tried to come up with a name for the act of strumming your fingers to your lips and making a low constant tone. Chase does it all the time and we often communicate in the car doing this. We have a constant back and forth "flubberwubbing". We've made up this word since apparently there is no other existing word out there to define this act. We were surprised when Google came up without a definitive answer.
While words may not be Chase's strong suit right now, he's EXCELLENT at flubberwubbing! :)
Also Chase can now raspberry in response to our raspberries. It's very cute!