You know, when I first started DUFUing last fall, I used the "-y" ending. But as I saw that PJ had a certain "thang" going here that was distinctive, I switched to his "-ie" ending. And I've never looked back. You too will be glad you've gone to the "-ie," mark my words.
And please remember to always capitalize the "U" in "DUmmie."
And I agree.... there's just something.... appropriate about the "ie" as opposed to the "y".
-Dan