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VIDEO: Tom Hanks Nicknamed Conan O'Brien 'Coco'

"You ruined my life!" joked O'Brien to the Oscar winner Tuesday night.

How did Conan O'Brien get the nickname Coco?

Tom Hanks popularized it, it was revealed Tuesday, the second night of TBS' Conan.

"You ruined my life!" joked O'Brien to the Oscar winner.

Hank's response: "Finally, he'll blame something on someone other than Jay."

Conan beat both Jay Leno and David Letterman in its Monday premiere.