Answer:
Long and thin, red within, with a nail at the end.
You do this into someone's ear when you want to be discreet.
It is a popular afterlife destination where you want to send people when you're mad at them.
This is the main ingredient in spaghetti and Mac-N-Cheese.
Very helpful if you intend to go gently down a river.
I touch the Earth, I touch the sky, but if I touch you, you’ll likely die. What am I?