Duff Champagne is a brand of cheap sparking white wine that is made by the Duff Brewing Company.
The slogan for Duff Champagne is that it is "The Beer of Champagnes". This is a parody of the Miller High Life Beer slogan "The Champagne of Beers". The gag implies that Duff Champagne is cheap and probably low quality in comparison to other champagnes.
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