“Hold onto your lily white butts.” Six words that probably won’t find their way into a White House correspondents’ dinner laugh routine again. Not because they were too risque, but because they reached their comedic peak once hilariously uttered by comedian Keegan-Michael Key, playing the president’s “anger translator” at Saturday’s dinner.

“I mean this was like the natural evolution of Luther,” said Key referring to the wildly successful cameo of the “Key & Peele” character. Luther — for those unfamiliar with the president’s pretend cabinet — is the guy whose job it is to bring down the verbal hammer (translate: do a lot of yelling) when Obama, ever the cool and allegedly aloof cucumber, obviously cannot. He’s sorta like the Hulk to Obama’s Bruce Banner.

Luther was all anyone could talk about after the dinner. Genius! Hysterical! How will they top it next year?! We’re not sure about that last one, but we do know how the whole thing came together.

We caught up with Key at MSNBC’s post-dinner dance fest, elbowing our way into the tight circle of congratulators who couldn’t stop giving him high-fives. According to Key, the idea of a comedic collaboration bandied about at one of the last year’s White House Christmas parties. There, the 44-year-old Comedy Central star met Obama speechwriter David Litt, who then posed a very Hollywood-like invitation: “You know, we should do something together.”

The two camps went joke-to-joke throughout March, Key said, even batting around the idea of his partner Jordan Peele showing up to do his Obama impression while Key transformed into Luther. But why settle for a impersonator when you’ve got the man right there in the flesh?

President Obama used Keegan-Michael Key, one half of the "Key and Peele" comedy duo, as his "anger translator" at the 2015 White House correspondents’ dinner. (AP)

“I said, ‘If POTUS can do it than I can do it,'” recalled Key, who was on the set of “a small independent film” the night before and flew into town on Saturday to rehearse with the president. Key and Obama’s jokes team, led by Litt, were honing punchlines up to the last minute. That Bradley Cooper “he just wanted a glass of water” line? It was supposed to be Kerry Washington. “But then she didn’t show,” said Key.

The rest, as they say, will live on in YouTube history.

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