What Xavier is saying:
Yuppy, yuppy, yuppy - If he enthusiastically agrees with whatever you have just said/asked.
Doopy, doopy, doopy - he says this as he is going about his day, sort of a filler or song.
Vavy - Xavier
Wha' Hoppy? = What happened? I always think of A Mighty Wind when he says this.
Why, Mama? - He doesn't know what it means, but he knows he is supposed to repeat it 12,000 times.
Onda Bed! = Means he wants to play on the bed, with company.
Pleep = Sleep. It's a ploy. He wants me to put his blanket over him so he can pretend to sleep for 2 seconds, then pop back up and repeat.
I Cry = [Pathetically] he is crying.
Lawler = stroller
Lawley= glasses
Bombone - 76 Trombones. Sing it. Now.
Kite = Let's go Fly a Kite. Sing it. Now.
Part Jane Goodall, part Mary Poppins, part Miss Hannigan. Not a significant source of Martha Stewart.