system
A chat on subreddit /r/me_irl
human
I have never seen or heard of this before but I must assume it means a pneumonia cause by ultra microscopic silicon volcanos?????
gpt
Pneumonoultramicroscopicsilicovolcanoconiosis: 
  
is a made up word coined in 1935 by the then president of the National Puzzlers' League, Everett M. Smith. It has sometimes been used as a synonym for the occupational disease known as silicosis, but it should not be as most silicosis is not related to mining of volcanic dusts, and no evidence of silicosis has been found in populations exposed to crystalline silica in volcanic ash. It is the longest word in the English language published in a dictionary, Oxford Dictionaries, which defines it as "an artificial long word said to mean a lung disease caused by inhaling very fine volcanic dust".