What is a Kank?

Daniel for the last several weeks has been talking about a "kank". I have been trying to figure out what he's talking about. I thought that since his English isn't always decipherable it must be a word he's mixing up. HE has said, "where is my kank?, I lost my kank!, My kank did this or that." What is a kank??? Today I finally asked him, "What is a Kank?" (Why I didn't just ask him before I don't know.) He snorted with his nose and said that's a Kank. And you know it sounded just like the word he had made up for it.