Appearing at the end of the 19th century as a blend of java and mocha, by the 1920s it became slang for someone who lacked mental abilities beyond that of a cup of coffee, probably influenced by moke. In the 1930s it also first appeared in the old Italian neighborhood of Chicago southwest side of "69th and Ashland" in the early 1930s. Considered to be a true Chicago lingo word.
- (uncountable, slang) coffee
- 1957: The chartroom door popped open before the startled admirals in the cockpit, and the beaming face of the boat's cook appeared to offer the hospitality of his craft, thus: “Would yer Majesty like a cuppa jamoke?”—Samuel Morison, History of United States Naval Operations in World War II (Illinois 2002, p.71)
- (countable, slang) stupid person, fool
- 2004: You and I both know that this is not enough money for the President and it's too damn much for some jamoke in the Bronx. — Dan Johnson, The Molotov Box (Xlibris 2004, p.24)
- (countable, slang) penis