The word "vituperation" looks Latin at its surface, and this is partly true, but there is more to the story than that. You see, in modern times, Finland is predominantly Lutheran, but when it was originally Christianized, Martin Luther had not even been born yet, and most of the population adhered to Roman Catholicism. As a relatively newer addition to the Catholic realm, churches in Finland would sometimes import clergy from other countries, not to mention the missionaries that continued to come in and convert even more Finns. At one point, a missionary from France spent a few years in Turku, and noticed many of the locals expressing their anger by saying "vittu perkele". As church records were typically in Latin, this missionary got creative and converted the Finnish profanities he heard so often into the Latin verb "vittupercelare". This new verb gained popularity due to its seeming extravagance, although eventually it got shortened to just "vittuperare", and, being from France (the French language having lost most if not all its geminate consonants by this point), the double [t] simplified to just one, thus: "vituperare". It was then from a derivation of this newly-coined Latin verb that "vituperation" and "vituperate" ultimately made their way into English.