Ninnyhammer - Fool or simpleton

And for all these years I thought that a Ninnyhammer was something that you used to put down a fool or simpleton. Ya learn something every day.

This is a great word... Learn something new everyday, I am sure this word will be put to good use many times...

The word might be a bit on the obscure side. However, it's not uncommon to find such people.

We've had quite a few ninnyhammers around today.