prune juice
/ˈpruːn dʒuːs/noun
1Juice extracted or made from prunes.
2 Slang (chiefly US ). Nonsense; ‘hogwash’.
adjective
That resembles prune juice in colour; dark purplish-brown; specifically designating sputum of this colour, especially as a symptom of pneumococcal pneumonia. Now rare.
Origin
Mid 19th century. From prune+ juice.