It is actually the never ending fear of long words .
If you don't believe me look it up
Alice: So doc' is there anything wrong
Doc: I'm affraid you have hippopotomonstrosesquippedaliophobia
Alice: AAAAAAARGH MAKE IT STOP PLEASE NO AAAAAAAAARG
Doc: they should make an abreviation for this ...
"sesquippedalio" relates to long words
"phobia" is an irrational fear
"hippopoto" and "monstro" (short for hippopotamus and monster) exaggerate the length of the word
synonym: sesquippedaliophobia means exactly the same thing
Person who coined the term: So what's her deal?
Colleague: Oh, she's afraid of long words. Do we even have a word for that?
Person who coined the term: You know what we should call it? Hippopotomonstrosesquippedaliophobia!
Colleague: That's just wrong.