Trump says that "Biden is the worst thing that happened to old people" in a recent interview.

That means, he doesn't like that people are talking about how old he appears, how his cognitive decline is making him a laughing stock around the world, and that he can't seem to understand the difference between a picture that has been photoshopped and one that represents reality. So, he mentions Biden, he blames Biden, and he keeps comparing himself to Biden while his cronies struggle to explain his demented ideas from reopening Alcatraz to pretending not to know who pays for tariffs and claiming there are tariff deals being done behind the scenes even though it's obvious to everyone there are no deals.

Why it means Covfefe,of course,which means absolutely nothing

Trump doesn't even know what that means. Stuff just be falling out of his face.