Difficult

My prefix is food. My suffix is rude. My infix comes in rounds. I keep you off the ground. What Am I?

related riddles

My sides are firmly laced about, Yet nothing is within; You'll think my head is strange indeed, Being nothing else but skin.

The weapon of choice to create the biggest shock.

It's been around for millions of years, but is never more than a month old. What is it?