What are to many cretins in the blood?

The phrase "too many cretins in the blood" is not a standard medical term and may be interpreted metaphorically to suggest a situation where there are too many ignorant or foolish individuals in a group or society. In a biological context, it could humorously refer to an excess of certain undesirable traits or behaviors. However, without specific context, it's challenging to provide a definitive explanation. If you meant something else, please clarify!