I'm not OP, but "bejabbers," while it's a mild swearword that could be used by anyone, was often associated with the Irish, and making fun of their speech patterns.
as christian hegemony was most often portrayed in legacy American media, they really do have a bunch of nonsense sounding words that are technically blasphemy, it used to be a more common thing to portray before the 00s when they started letting commonly understood swearing on media
1751, in Oxford and Cambridge student slang, "a trick, jest, hoax, imposition, deception," a word of unknown origin; it also appeared simultaneously as a transitive verb, "deceive by false pretext." A vogue word of the early 1750s; its origin was a subject of much whimsical speculation even then. "[A]s with other and more recent words of similar introduction, the facts as to its origin appear to have been lost, even before the word became common enough to excite attention" [OED].
THERE is a word very much in vogue with the people of taste and fashion, which, though it has not even the penumbra of a meaning, yet makes up the sum total of the wit, sense, and judgment of the aforesaid people of taste and fashion. This word is HUMBUG. [The Student, vol. II no. 2, 1751]