Wiktionary
adv. 1 (non-gloss definition: Used as an oath to emphasis the veracity of an associated statement.) 2 (non-gloss definition: Used as an intensifier) interj. (non-gloss definition: Used as an exclamation of surprise.)
Wikipedia
By God was the third album released by Christian metal group Disciple in 2001. It was a dual-disc, the second disc being a bonus disc for the buyer to give "to someone who needs it...". The album has been remastered and re-released just like the last album ( This Might Sting a Little). The cover was changed to a different style.
Usage examples of "by god".
If this Curse was truly sent by God, he wasn't sure who he was pray to for protection.
If this is the way we'll get a bite at a pirate or two, then by God I'm up for it.
The folk who ran the Selma Cluster didn't care about ship names, but by God!
They built a simple symbol structure: He was the world, a perfect sphere without blemish, made by God's own hands, a world as strong and divine as thought.
And, by God, by the end of the evening it would not be his fault if it transpired that there was in fact no shred of stuffing left in the hoary old fairytale of 'A good time in Paris'.
The universe has been described as a perfect piece of clockwork, a mechanism wound up by God to tick forever.