"Uh"

Preston has his own language.  He sometimes says something that sounds like "oodie goodie" or "oydie goydie", I still can't figure out what that one means.  Then he'll say, "wassat"  which I think means, "what's that?"  The problem is, he also says, "is at is"  while pointing, which I also think means "what is that?"  He understands more words that he'll actually try to say.  He'll point to the light when I ask him where it is.  He'll point to his belly button, and he'll go get his "ba ba" if I ask him to.  The thing is, his favorite word right now is "uh", sort of the cavemanish "UHH".  He points and shows me things that all have that same pronunciation in his vocabulary, yet he expects me to be able to translate.  For example, yesterday morning Preston brought me one of his snow boots.  He said, "uh" and handed it to me.  I thought, "ok, he wants me to see this boot."  I told Preston, "thank you" and put the boot down.  He cried, grabbed the boot and handed it back to me with another "uh".  I told him "thank you" again and handed him back the boot.  He was getting angry at this point and said, "uh" very forcefully, handed me the boot, then stood on his tippy toes.  I picked him up and put him on my lap.  He grabbed the boot and gave it to me again.  That's when I realized that "uh" actually means, "I want you to put this boot on my foot woman!!"   I put the boot on his little foot and he limped around happily, until he came across the other boot and wanted it on too.  I understood the language better the second time around....maybe I'll become fluent in Prestonese.