Okay, the copy I have has "filling up St. Peter's shoon" as well. Seing as how the Man in the moon would indicate insanity, (i.e. 'looney', moonstruck), It just may be a backhanded slap at the pope, saying a madman was filling the shoes.
However, the wife dissagrees. She maintains that the line indicates a skin boat, or small dingy. The reference is that she says the small boats were called St. Peter's shoes.
Now I am really confused. Still, I cannot find any evidence her story is correct.
Having said that, I may be sleeping on the couch tonight!
Mikal