This is mature content. Not because of the nudity (which is only natural), the mild drinking of alcohol, or the milder swearing. More accurately this is content that requires a certain amount of maturity from the reader.
That the title is a play on a classic joke format tells you all that you need to know; it is supposed to be funny and poke fun at itself too. It laughs at all sorts of institutions including the local supermarket.
The written form is quadruple rhyming verses. There may be more technically accurate terms for this but that is far beyond this review. Essentially each story is a rhyming poem of which most are illustrated. The rhyming is deceptively simple. It can't have been easy to write and what is written is so descriptive and often very clever.
It is incredible how skillful this requires the author and illustrator to be (same person). He is clearly adequately adept at both uses of the pen here.
But don't read this if you are going to choose to be offended. Buy it and give it to someone else instead as it deserves to be read by more people.