Fuck Buckle or ‘Fuckle’
One reason that the word fuck is difficult to trace etymologically is that it has been used far more extensively in common speech, than in easily traceable writings.
There exist multiple urban legends that advance the word allegedly being an acronym.
One of these urban legends is that the word fuck originated in Irish law. If a couple was caught committing adultery, the two would be punished "For Unlawful Carnal Knowledge In the Nude", with "FUCKIN" written on the stocks to denote the crime.
A variant of this legend alleges church clerks to have recorded the crime of "Forbidden Use of Carnal Knowledge” and another places the origin on a royal permission allegedly granted during the Middle Ages. Due to the Black Death and the consequent scarcity of resources, villages and towns supposedly attempted to control population growth by requiring permission to engage in intercourse.
Royal permission is said to have required placing a sign visible from the road reading: " Fornication Under Consent of King", later shorteneto FUCK.
