Jamoke is a slang term that has two different meanings. According to Merriam-Webster, it can be used to describe an ordinary, unimpressive, or inept person, typically used as a term of mild or joking disparagement for a man. On the other hand, according to Dictionary.com, it means coffee or a cup of coffee. The term "jamoke" was originally an English slang that first appeared at the end of the 19th century for coffee, which was a combination of the words "java" and "mocha". The term was also used as a word to describe "an ordinary, unimpressive, or inept person," in that "a cup of coffee is more impressive". The word also showed up in Italian-American language in New York City, both "jamoke" and "moke" to describe an idiot. However, "moke" also became a slang term for the "muscle" of a gang, or a man who is more muscles than brains.
There is no information available on the ingredients or materials used to make jamoke, as it is a slang term for coffee and not a specific product.