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Box-standard, ffs
[citation needed]
The other most often repeated theory of the derivation is that it is a mispronunciation of 'box standard', the term referring to unmodified goods coming straight from the box. This appears to be a later expression, first recorded in 1983, but is likely to have been around in everyday speech for some years prior to that. If one phrase did influence the other, it is more likely that 'box-standard' is a mispronounced or euphemistic version of 'bog standard'.
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It may be apocryphal, but it is nevertheless "common knowledge" (as they say) that Bog Standard referred originally to the ordinary, unsophisticated Meccano set which was called Box Standard. The one with all the bells and whistles was called Box Deluxe, which is similarly reputed to be the origin of Dog's Bollocks.
Box-standard, ffs. The end has already started.