From the site
http://www.gourmetcoffeelovers.com/d...offee-tasting/
"EARTHY—Musty taste or aroma, like moist black earth or soil, cellar-like, mushroomy. May or may not be desirable. Indonesian gourmet coffees typically have a spicy, earthy flavor."
The question piqued my interest because I remember somebody on the boards having a recurring contest to see who could roast Yirgacheffe beans to have a lemon flavor and I never associated that bean with earthy. Good luck.