[mmr]

My Macaw will re arrange words also. He had about a 70 word vocab when we got him. Since we got him he has learned my son's name (tell you how much I am yelling for him or at him!!!lol). So now instead of calling for Zorro (old mommies dog that has been gone for over 5 years) he now will say "Alec, here boy (dog whistle to foloow). He will also say what the f*&^, but then turn around and say F*&^ off! He will also say ouw, but then says ouch, that hurt! Then he will take those and put themin another word arrangement. I think they know the words, so the "spice" it up a little.
Teal will also sit in his cage and whisper quietly to himslef. He either is saying all the words he knows or is practicing new one's he just hasn't gotten down patt yet.

When does a screaming fit, I just ignore him ,but when he is done we will be on his cage telling himself, " Bad, shut up, quit, stop it". All while saying this holding his foot up (like we do with our hands when saying stop).
He will also when I walk in the room, hold his foot up and say "HI"!

I think your gray is just saying those things when "cleaning" his beak because that is what was said to him while he was doing it. Thus he associates that word with that action!