On Friday the English-speaking world was startled to find itself suddenly reacquainted with the 14th-Century term "dotard", thanks to an unlikely source - Kim Jong-un.
The North Korean leader used the ancient word to describe Donald Trump several times in a fiery statement denouncing the US President's recent UN speech.
The statement was an unprecedented first person address to Mr Trump and as the diplomatic community digested its meaning, many others rushed to look up this unique insult.
📈 Kim Jong Un calls Trump a mentally deranged U.S. dotard. Searches for 'dotard' are high as a kite. https://t.co/HztPoLSjXi— Merriam-Webster (@MerriamWebster) September 21, 2017
Mr Kim used "dotard" not once, but twice, to refer to Mr Trump.
"Action is the best option in treating the dotard who, hard of hearing, is uttering only what he wants to say," Mr Kim wrote, displaying a keen sense of the original meaning of the word.
But he ended his screed with the ominous line: "I will surely and definitely tame the mentally deranged US dotard with fire."
So what exactly does "dotard" mean?
The Oxford English Dictionary defines it as "an old person, especially one who has become weak or senile".
Its US brethren, Merriam-Webster, further clarified that the word initially meant "imbecile", and stems from the Middle English word "doten" which means "to dote".
This wasn't the first time North Korea used the term (we'll get to that in a minute), but it certainly was the first instance it garnered so much attention.
Unsurprisingly the word has spawned its own hashtag #dotard, which has since trended worldwide.
The Twitterverse sprang into action.
#dotard— Funny Or Die (@funnyordie) September 22, 2017
do·tard (dōdərd) noun
A word you didn't previously know existed, but googled today and said, "Damn, that's pretty accurate."
When Kim Jung-un knows better English words than the President of the United States… #dotard— Trump's a #dotard (@williamlegate) September 22, 2017
There were jokes laced with mild anxiety over the possibility of a nuclear holocaust.
It's all fun and games until the two crazy narcissistic maniacs progress from name calling to killing millions of people #dotard— Alt Fed Employee (@Alt_FedEmployee) September 22, 2017
Some have also matched it with Mr Trump's own term for Mr Kim.
But others did not find it funny.
Kim Jong-Un kills millions, starves his citizens and rapes girls yet Liberals are praising him for calling Trump a #dotard— Collin Rugg (@CollinRugg) September 22, 2017
Lost in translation?
But some observers are debating whether the Swiss-educated Mr Kim - or his English translator- really meant to use that word in the English statement.
They have pointed out that a slightly different term was used in the Korean-language version.
The English version of Kim Jong Un's fiery statement calls Trump "dotard." The Korean version says "늙다리미치광이" = lunatic old man pic.twitter.com/LNXWsJLtBB— Anna Fifield (@annafifield) September 21, 2017
The Korean original statement said "늙다리 미치광이," which means old beast lunatic -- which was translated into "dotard." https://t.co/2uQ0Xsxe2X— Jihye Lee 이지혜 (@TheJihyeLee) September 21, 2017
North Korea's rhetoric has its own special brand of bombast, and it particularly excels in epithets and ad hominem insults.
The US, for instance, is never just an enemy, but a "hooligan", "scoundrel", and a "gangster".
Never one to shy from misogyny and racism, North Korea has called former president Barack Obama a "wicked black monkey", while the dress sense of Mr Kim and Mr Trump's common enemy, Hillary Clinton, has been mocked as resembling both a "primary schoolgirl" and "a pensioner gone shopping".
But it perhaps reserved its most colourful insults for former South Korean President Park Geun-hye, known for her hardline stance against the North and popularly known as "the bitch" in Pyongyang.
Revealing its penchant for animal-themed comparisons, North Korea has over the years called her "an ugly female bat-disgrace", "matchless dragon lady", "a tailless crazy old bitch", and an "old cat groaning in her sickbed".
It also appears to have form, as she has even been called - wait for it - a "dotard".