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.
by Dan Richards February 19, 2008

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