Another term for fans of the Disney film "Pirates of the Caribbean: The Curse of the Black Pearl." Usually female, rummies (singular: rummy) are so named because of the Johnny Depp character Jack Sparrow's chronic consumption of the drink throughout the film. And since the line, "But why is the rum gone?!" is proclaimed by sparrow-chasers to be the funniest gol' dang thing they've ever heard, the term "rummy" inevitably resulted. See also teenybopper and the aforementioned sparrow-chaser.
I'm getting awfully tired of a couple of my friends; they're nothing but hopeless rummies that are hooked on that damn Johnny Depp guy.