1)
What is "Gelelo"?
1.
Rashi: It is dung. Ibn Ezra - this is like "Ka'asher Yeva'er ha'Galal Ad Tumo."
2)
Why will people say "Ayo"?
1.
Malbim: If he is rolled to a high place and falls from there, his fall was sudden; it was not in stages. People who saw him a moment ago will ask 'where is he?!'
