ahh, so concisely stated, char
i learned many new expressions based on the 'biscuit' word by browsing that slang link...some quite humourous
btw, the most common use of the expression that I recall was when father and i would be doing a project or chore and as we approached completion he would say something like, "now if we can just get this last section to hold we'll be in Biscuit City"
the phrase has already been passed onto junior and applied a few times...i love when expressions are filtered down through the generations