05/17/2010 05:12 am ET Updated Dec 06, 2017

Kimmel: Leno's 'Always Running To Tattle To Oprah' (VIDEO)

Jimmy Kimmel sat down with David Letterman last night, and of course, the topic of conversation quickly veered toward his thoughts on Jay Leno, who he described as a close friend before the fiasco.

When asked about the night he taped his entire show dressed as Leno, Kimmel got in a bonus jab, saying, "It's fun to be Jay. It's easier." But it wasn't that instance that may have damaged their friendship. Rather, it was Kimmel's appearance on Leno's show later that week that may have been the final straw.

Leno would call it a "sucker punch" when he sat down with Oprah. Joked Kimmel: "He's always running to tattle to Oprah." But Kimmel did acknowledge that Jay may have been right, saying, "I didn't feel like I did sucker punch him, but then I looked it up in the dictionary and it turns out I did."