1. A mound of sand, usually found in a desert setting or near a beach.
2. The best science fiction novel ever written (by Frank Herbert). First published in 1965, and later made into a questionably decent film by director David Lynch.
A term used to describe a sports professional past his/her prime. Most commonly used in association with a washed-up baseball catcher or a previously successful golfer.
"He was such a good catcher, and now he's just an ol' rusty cup."