The art of using VERY long words to confuse
people. It comes from the root 'sesquipedalian', which means one who uses long words to (again) confuse
people. Source: Mrs. Burns
Dictionary of Obscure, and Preposterous Words.
Hippopotomonstrosesquipedalianism is the
art of utilizing extremely elongated lexicons to
give the appearance of being more
intelligent to one's acquaintances.