Okay. I'm finally casting my vote but I have to take issue with with two of the contending words.
Gobsmacked Hardly hogwash to me and quite general parlance amongst my peers (but it would be a privilege to see it posted as Word of the Day by Anu).
Demesne Ditto. Quite a common term for this neck of the woods (pun intended - with smug reference to a recent thread).
I'll balance off the votes by nominating five others from the list....
p. triboluminescence Cannot say it on its own let alone use it in a coherent sentence. HOGWASH!
enantiodromic - ditto! HOGWASH!
k. hermetic - Love this one. It's like a cross between a hermeseta and a tic-tac. HOGWASH!
c. anacampserote - some sort of a compote? HOGWASH!
h. dipsetic Quite a dispeptic word! HOGWASH!
And this concludes the vote from the Irish jury........ [nil point emoticon]