Mix the oats, sugar, and cocoa together in a bowl. Add the butter, and use your hands to mix the ingredients together to make a thick dough. Mix in the coffee, vanilla, and chocolate until thoroughly blended.
Place the coconut flakes in a small bowl. Pinch off small amounts of dough and roll between your hands to make small balls, about 1-1/2 inches in diameter. Roll the balls in the coconut flakes. Balls are ready to eat, or may be refrigerated 2 hours to become firmer.