therefore: used facetiously to indicate that the reasoning that had gone before or the conclusion that follows is specious or absurd
Word origin
[1595–1605; prob. repr. a popular early mod. E pron. of L ergōergo, with ĕr ˃ ar, laxing of ō, and excrescent l]This word is first recorded in the period 1595–1605. Other words that entered Englishat around the same time include: Creole, option, premium, toss, zero