dotard 1. a person, especially an old person, exhibiting a decline in mental faculties; a weak-minded or foolish old person. the definition of dotard "I will surely and definitely tame the mentally deranged U.S. dotard with fire." - Kim Jong Un referring to Donald Trump. The crazy pissing match between Trump and Kim Jong Un, finally brought in some humor Both of these clowns are absolutely crazy. But on the upside, Jung Un gave the gift of a new nickname for Trump, instead of Donald Trump, I'm going with Dotard Trump! The right had many derogatory names for Obama and Michelle. Well, now it's time for Dotard Trump. Thanks, Jung Un!