President Trump called Kim Jong-un "rocket man" and he'd totally destroy North Korea.
Kim responded back by calling him, what many are calling a hell of a burn.
"I will surely and definitely tame the mentally deranged U.S. dotard with fire."
So what the hell is a dotard?
Well the dictionary says a dotard is "a person in his or her dotage" with dotage meaning a state of senile decay.
Naturally, social media lost their collective minds over the burn.