An idea rain bird is someone who spouts off short bursts of inspiration all over the place without ever stopping to focus on any of them. An idea rain bird churns out sloppy ideas without caring where they land. Idea rain birds have tons of ideas. But few of them have any impact.
Yes, you need to have lots and lots of ideas. Yes, you need to explore tons of directions. But when you say, “What if we did this…” Take the time to really think about your idea before moving on to the next one.