Doctors used to have poetic names for diseases. A physician would speak of consumption because the illness seemed to eat you from within. Now we just use the name of the bacterium that causes the illness: tuberculosis. Psychology, though, remains a profession practiced partly as science and partly as linguistic art.
Because our knowledge of the mind's afflictions remains so limited, psychologists even when writing in academic publications still deploy metaphors to understand difficult disorders. And possibly the most difficult of all to fathom and thus one of the most creatively named is the mysterious-sounding borderline personality...