The 63-year-old brought up the subject during his "Late Night" appearance on Tuesday. But his attempts at jovial ribbing came off forced and partly serious.
He said Fallon acted like a "wimp" during their 2012 confrontation, talked up his "good friend Kanye," and mocked Fallon's appearance.
“You can make all the jokes you want, but I guarantee you, Mr. Fallon, that my ass in a good pair of running shorts, looks a hell of a lot better than your ass," Jenner said.
Watch part two of the interview below: