Is this an idiom or just nonsense? "If I had the side of a mountain..."? Does it have anything to do with the sun he mentioned later?[Audio]

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FYI, whatever this movie is contains a lot of slang tha most native speakers don't understand either.

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I do not think this is an idiom, but it may well be slang.  I doubt it is connected with the later comment about the sun.

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Can you give more context for this audio clip? What's it from--a movie, a show?