Is this 'dang' a sowpub invention

I notice a lot of people at this forum using the word 'dang' a lot. This is a new one for me. Am I behind the times, is this an American adaptation of 'dam' or 'darn' or is it strictly a word you use at sowpub?

I'm curious. The first time I saw it, it actually stuck with me and I was wondering about it in the shower one day. If you actually say it out loud, you are liable to bite your lip. Could be a dangerous word to use if you're really angry at someone. No?

Regards,

Eliz.