There's a lot of dispute over the word bloody. It is likely it has multiple origins - depending on usage.
Clod's example is one of the possible origins, another is By'r Lady, again used often in Shakespeare and appears in various other places. There's also a dutch word, irrc that is similar to bloody and fits the usage more closely - I'll have to wiki it.
ok - yes, wiki'd:
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It has also been surmised that bloody is related to the Dutch bloote, "in the adverbial sense of entire, complete, pure, naked, that we have transformed into bloody, in the consequently absurd phrases of bloody good, bloody bad, bloody thief, bloody angry, &c, where it simply implies completely, entirely, purely, very, truly, and has no relation to either blood or murder, except by corruption of the word
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https://en.wikipedia.org/wiki/Bloody#cite_note-2