Bloody

Bloody is a commonly used expletive attributive (intensifier) in British English. It was used as an intensive since at least the 1670s. Considered "respectable" until about 1750, it was heavily tabooed during c. 1750–1920, considered equivalent to heavily obscene or profane speech. Public use continued to be seen as controversial until the 1960s, but since the later 20th century, the word has become a comparatively mild expletive or intensifier.

The word is also used in the same way in Australian English, New Zealand English and in other parts of the Commonwealth or in ex-Commonwealth countries. In American English, the word is uncommon and is seen by American audiences as a stereotypical marker of British English, without any significant obscene or profane connotation.

Use of the adjective bloody as a profane intensifier predates the 18th century. Its ultimate origin is unclear, and several hypotheses have been suggested.

It may be a direct loan of Dutch bloote, used "in the adverbial sense of entire, complete, pure, naked", which was suggested by Ker (1837) to have been "transformed into bloody, in the consequently absurd phrases of bloody good, bloody bad, bloody thief, bloody angry, etc., where it simply implies completely, entirely, purely, very, truly, and has no relation to either blood or murder, except by corruption of the word."

The word "blood" in Dutch and German is used as part of minced oaths, in abbreviation of expressions referring to "God's blood", i.e. the Passion or the Eucharist. Ernest Weekley (1921) relates English usage to imitation of purely intensive use of Dutch bloed and German Blut in the early modern period.

A popularly reported theory suggested euphemistic derivation from the phrase by Our Lady. This possibility was discussed disapprovingly by Eric Partridge (1933). The contracted form by'r Lady is common in Shakespeare's plays around the turn of the 17th century, and Jonathan Swift about 100 years later writes both "it grows by'r Lady cold" and "it was bloody hot walking to-day" suggesting that bloody and by'r Lady had become exchangeable generic intensifiers. However, Partridge describes the supposed derivation of bloody as a further contraction of by'r lady as "phonetically implausible". According to Rawson's dictionary of Euphemisms (1995), attempts to derive bloody from minced oaths for "by our lady" or "God's blood" are based on the attempt to explain the word's extraordinary shock power in the 18th to 19th centuries, but they disregard that the earliest records of the word as an intensifier in the 17th to early 18th century do not reflect any taboo or profanity. It seems more likely, according to Rawson, that the taboo against the word arose secondarily, perhaps because of an association with menstruation.

...
Wikipedia