walking noses

Ro is frequently thrown by idioms such as "let's hit the road" or " let's get rolling". He came up to me the other day and said, "My nose is walking." He he. Instead of running. Other comments have a more obscure derivation and I can't really figure them out. He slipped on the floor in the kitchen and he said, "Look Mommy! I fell down just like a fish in the grass." ???? What's that supposed to mean?

He also claims he likes eggnog because it tastes like flowers.