Pus from an infected toe.
Many years ago shortly after I had qualified as a podiatrist I was treating an elderly man for a painful and obviously infected toe, As I was debriding the hard skin and scab from the end of his toe the trapped pus was released under enormous pressure, it covered my forehead, nose and some entered my mouth, the taste actually defies description.
The old chap was so upset that after I had washed my face about 5 times and rinsed my mouth equally he insisted on giving me some excellent malt whisky, the first mouthful he said I should rinse and spit out but the subsequent three mouthfuls I swallowed, it did the trick.