An uncommon sex act described as follows. "An Ancient Mariner begins when you're having doggie style sex which culminates in an ejaculatory climax onto your partner's back. When she (or he) turns around to tell you what an awesome job you did, you throw a bowl of clam chowder in their face." Also known as "The Reverse Houdini"
I could not give Jill an Ancient Mariner because she's allergic to Clam Chowder.