The children's toy set Meccano came in two standards: Box Standard and Box Deluxe. Box Standard was the basic model and is believed to be the derivation of the term bog standard, which means average.
Box Deluxe, on the other hand, was used by the workers in the Meccano factory to mean posh or high quality. Over time, Box Deluxe changed to Dog's Bollocks as workers swapped the initial letters of the words. It spread quickly. Other versions, such as the mutts nuts and the dog's danglies, emerged soon afterwards.
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