...the most vulgar of words in the English language.
It is a very old word.
Shakespeare used the vulgar word (or at least spelled it out) in Much Ado About Nothing. (Read the ‘and’ as ‘N”). And then had another character repeat the line so that everyone would ‘get it’.
By my life, this is my lady’s hand: these be her very C’s,
her U’s, and her T’s; and thus makes she her great P’s.
Vulgar - def: rude, indecent, indelicate, offensive, distasteful, coarse, crude, ribald, risqué, naughty, suggestive, racy, earthy, off-color, bawdy, obscene, profane, lewd, salacious, smutty, dirty, filthy, pornographic, X-rated; More
Similarly, “If you see Kay ...” has been a throwaway line in more than one movie and play.