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A phrase made popular by the Warner Bros' classic Looney Tunes cartoon, where Porky the Pig would show up at the ending screen proclaiming "That's All, Folks."

The phrase is often used mockingly or used as a somewhat humorous-toned but not actually meant to be funny manner.
Th-th-th-that's all folks!
by NickTheAmericanGuy December 11, 2010