There's a French man, a British man, and an American are captured by wild savages. The savages tell them that they are going to kill them and make them into boats, and they have to kill themselves and choose how they die.

The French man decided to die by sword he stabbed himself and said "Long live France!", and stabbed himself

The British man chose the pistol and said "Long live Britain and shot himself.

The American chose a fork. The savages asked if he was sure about that, and he said yes.

The American started stabbing himself all over with his fork saying "Fuck your boat! Fuck your boat!"

This gruesome joke has turned into an entire metaphor about relationships in "code". In this metaphor, each person is a boat if you want to have a relationship with someone, that person is a prospect boat. The metaphor is adlibbed until it just gets out of hand. It does work well when around people, because no one knows what you are talking about. Maybe it will be a new fad.