Aggle flaggle blabble!

G has started adding "Mommy" or "Daddy" to the end of every sentence. "Blahblahblahblah big truck Mommy!" And if you do not acknowledge what he is saying in exactly the way he wants you to, he will repeat it and repeat it and repeat it (and repeat it). I try, "Oh!" and "Wow!" and "Yes!" and "That sound interesting!" and even "Whoa - tell me more about that!" But for the life of me I usually have no idea what the sentence is about. I love it. He is totally attempting to engage in conversation. Just this morning, he said,"Forggemheemaytumlatedhuminwen, Mommy!" I mean, what would you say?