An Etymological Dictionary of the German Language/Bohnenlied
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Bohnenlied, ‘bean-song’ (in the phase etwas geht über das Bohnenlied, applied to something incomparably good); the word may be traced as far back as the 15th cent., but the song itself has not been discovered. It may have been an obscure poem, since the bean among various nations is adopted as the symbol of lewdness (comp. the mediæval bean-feast, Gr. πυανέψια).