Anyone else here speak Polish?

I just need a little help with grammar and meaning of a few things.

First, what is the literal meaning of a word my father particularly loved:
Dupajas? I don't think it refers to a male donkey but has the same
connotations.

Second, how nasty exactly is (excuse the language) Psiakrew Cholera?

Third, the noun for thunder is "piorun" I think? When you put it into the
genitive case (example, in the movie title Agnes Of God, the "Of God" part is
genitive case) how would "of thunder" or "daughter of thunder" be rendered?

This is for my story, which God willing might get moving now as Louie slowly
recovers from his peanut butter evil. And as the Poles would say, dzien kuje!
(I think Stosh is getting this one though.)

Blessed be,
Baha