Bloody

My favourite ones: way out in front is Oddsboddikins (God's body). Of the many weird an wonderful ones available, Queen Elizabeth I's favourite oath was apparently 'God's Death', which certinly gets the point across.
In Regency Britain, ladies weren't supposed to use oaths, so the most modish one for them was "'pon rep", or 'upon my reputation' - held to be the most valuable thing a lady possessed!