adj. (trading).Bad, ropy butter; nearly equivalent to VINNIED: in the English Dialect Societys Chester Glossary, BINGY = a peculiar clouty or frowsty taste in milkthe first stage of turning sour.
1857. GASKELL, Life of C. Brontë, iv. The milk, too, was often BINGY, to use a country expression for a kind of taint that is far worse than sourness, and suggests the idea that it is caused by want of cleanliness about the milk pans, rather than by the heat of the weather.
1860. GASKELL, Sylvias Lovers, xv. Ive heerd my aunt say as she found out as summat was wrong wi Nancy as soon as the milk turned BINGY, for there neer had been such a clean lass about her milk-cans afore that.