the origin of swear/bad words

f**k, which is sometimes described as an Anglo-Saxon word, is in fact not that old in its current form.  It does not appear in writing until the early 16th century.  However, there is a personal name which pops up in records from the late 13th century (according to John Ayto), John le f**ker, which indicates that the word was around at least at that early time in some form.  It's possible that it was not recorded in writing prior to the 16th century because it was in fact considered obscene. No matter what its written status, few etymologists disagree that the word is of Germanic origin, although no one can say precisely whence it came. The word first appeared in Scotland, perhaps indicative of a Scandinavian source; there is, after all, the Norwegian dialectical fukka "copulate" along with the Swedish dialectical focka "copulate, hit" and fock "penis".  Oh, and by the way, this word is simply not an acronym; the widely popular explanations that the word derives from Fornication Under Consent of the King or For Unlawful Carnal Knowledge are absolutely incorrect.