I don't know about this one. The most obscure word I know seems to change from day to day since I have joined AWAD.

This week Poshlost is my favorite. And I love the sound of gerund. I know they are not WAY out there but I also know that if I say either one of these words in casual conversation people will look at me as if I am from an other planet.

Atwizzle (thank you wow) I have now used three times. Twice on the Board messaging and once in real life .