Is it really an obscenity? Closest I've heard "oath" used as an obscenity is "bloody oath" or words to that affect, which means exactly the same as "damn right"

Is it really an obscenity? Closest I've heard "oath" used as an obscenity is "bloody oath" or words to that affect, which means exactly the same as "damn right". Bloody and damn are both mild swear words, but haven't seen "oath" used as an obscenity in its own right.