You heard right: "black hairy tongue." It may sound
like something a not-very-imaginative high school freshman would concoct, but
the truth is, it's true. Imagine calling in sick: "I'm coping with a
wicked case of black hairy tongue..."
Left: A woman's tongue after she was diagnosed
with "black hairy tongue." Right: Her tongue after the condition cleared
up. (The New England Journal of Medicine)