Gents, ladies, rabble, rabblettes:

Reading simultaneously The Steel Bonnets and The Complete McAuslan, both, of course, by George MacDonald Fraser. (And that, me laddies, be a right proper Scots name, no?)

In his discourse on his (or "MacNeill's") unease with servants, Fraser mentions a family member of one of his Jocks ribbing him about "Wha' shot the cheese?"

This is one of those bits of regimental lore, I fear, explication for which I must seek from a broader base of knowledge.

It is presented as a dig at his regiment.

Anyone care to explicate further?