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Okay, I am not an Ork player, so I don't own their Codex, which is why I am not looking this up there.

I got rickrolled by some deffrolla equipped vehicles at 'Ard Boyz this year, and I had a question about that particular piece of equipment. If I choose the Death or Glory! option when I am being attacked, does the Death or Glory! attack resolve before, after, or simultaneously with the rolling of deff that I must suffer?

From the Ork FAQ:

Q. Does a unit that successfully stops a deff rolla-equipped Battlewagon’s Tank Shock suffer any hits? (p55)
A. Yes, it does. In fact, it suffers 2D6 S10 hits!

Since it would be hard to determine whether or not the tank has been successfully stopped until after the DoG is resolved, by this FAQ it seems implicit that the DoG attack should be resolved first.

The roll attacks at the same time. But it happens no matter what.