That is Adin's newest saying, "Wait 'till I..." Here are some lovely examples...

If he wants to wear something that is too small, he will say, "Wait 'till I be little, and then I wear it."
If he wants something that is girl specific, i.e.; makeup and I tell him that what he wants is for girls, he will say, "Wait 'till I be a girl, then I can wear it. And Daddy be a girl, and Arin be a girl. Then we can all wear makeup!"
And my favorite as of late... We were at the mall and his balloon got away from him. He asked me to get it and when I told him that I couldn't reach it, he ever so sweetly looks up at me and says, "Wait 'till I be a bird Mommy. Then I fly up there and get it. Just wait 'till I be a bird."