I’d like to know, too. There was a category on Jeopardy, during the 4th of July week, that was ‘Rick and Morty’. Turned out all the answers were either someone named Rick or Morty or had Mort in their name (one answer was Morton as in the salt). I didn’t have any idea why they would have a category called that. I assumed it was some type of TV program of which I had never heard.
It’s an edgy cartoon. The hook is it uses lots of existential angst in the comedy. It’s not very well drawn but the creator outs enough jokes in it that a few hit very well.