An inverse analogue to "dog-years," in which a dog is said to age seven years for every human year (which pre-Trump was the saddest of time warps known).
Now, "Trump-years" defines the human experience of aging one full human year (with all the ignominies that accompany aging) for every one month that that man is in office.
"My God, I've gone grey in just these three+ months, but of course, I am aging in Trump-years. By the time we get him out in 2020 I will be over one hundred Trump-years-old! "