None of these acronyms was ever recorded before the 1960s, according to the authoritative lexicographical work The F-Word, and thus are backronyms.
In any event, the word fuck has been in use far too long for some of these supposed origins to be possible.
There is a theory that fuck is most likely derived from Flemish, German, or Dutch roots, and is probably not derived from an Old English root.
A different false etymology, first made popular on the radio show Car Talk, states that the phrase "fuck you" comes from the phrase "pluck yew" and relates the origins of fuck to the myth surrounding the V sign.
This myth states that French archers at the Battle of Agincourt insulted the English troops' ability to shoot their weapons by waving their fingers in a V shape; after the English secured a landslide victory, they returned the gesture.
it is uncertain to what extent the word fuck was considered acceptable at the time.
The stem of fuccant is an English word used as Latin: English medieval Latin has many examples of writers using English words when they did not know the Latin word: "workmannus" is an example.