What in God's name is a lexical Pagliacci????

Amos, you have raised the bar on verbose pomposity again! I'm impressed. I intend to use the term "lexical Pagliacci" frequently as soon as I find out what it means, and I will use it to intimidate the less erudite around here, such as the cook over at Rombo's. He'll stare at me in stupefaction, not knowing what to say! Oh, what fun it will be! ;-)