Well, I stand by my original assessment that this was a unique way to interpret "goddamnit." No one else I've ever come across thought it meant damning God, rather than asking God to damn something. (And it's not the inclusion of "damn" that makes it a no-no Commandment-wise; it's the inclusion of "god." If Peg had just written "dammit" it would have had exactly the same meaning, the "god" part implied--because no one else can damn, technically.)