Jim Gaffigan On David Letterman: Talks Parenting Five Kids, Creating His Own Nationality (VIDEO)

05/08/2013 04:52 pm ET

Jim Gaffigan – comedian, actor, father and now author – stopped by "The Late Show With David Letterman" on Tuesday to talk about the release of his book Dad Is Fat (read an excerpt here).

But as he explained to Dave, Dad apparently is also forming his own nationality: Gaffganistan.

Watch the clip above and pick up your copy of Dad Is Fat in book stores everywhere.

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