A noodle can be a
number of things. Most commonly is it a
food that people cook by putting it in
boiling or near boiling
water and adding various spices for
flavor.
I noodle is also another name for one's brain. So when someone tells you to use your noodle they want you to think about something.
There is also a science of throwing noodles on the wall in order to read them and tell the future.
I suppose this would be using your noodle to examine noodles to determine the outcome of other's noodles.