Starving like Marvin

Please tell me the origin of "starving like Marvin".

Starvin' Marvin was a character in the U.S. television program "South Park." But I don't know which came first -- the character or the phrase.

109 Starving Marvin (Thanksgiving Special) The boys order a watch but instead get an Ethiopian boy; meanwhile, raging turkeys terrorize the town.

tvmegasite.net/prime/shows/southpark/guide.shtml

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