Phrase used to ask god to damn something, usually a situation, and it in no way means that you want to damn god, only a retard would think that. Also, when used at a person, it does not mean that you want god to damn that particular person, it means that you want god to damn the situation that the person caused, indirectly damning him or her.
What you say when you're frustrated about something. Not 'goddammit', god damn it, 'go ddammit', 'goddamn it', 'god dammit', or anything else like that, god dammit.
Jimmy: You have work tommorow, and a pay cut, and more hours.