(1) One who ponders puddles
(2) One who over analyzes every detail of life and perceives meaning in objects or ideas that have none.
Guy: This morning I was looking at a drop of dew on a freshly mowed blade of grass and it made me think of how a human life can be cut down so cruelly by perfectionism.
Girl: I'm sorry, I can't take you seriously. You're such a puddle ponderer.