Dr. Frank has a post on one of his "found" objects titled "some prats are south."

According to this definition prat can mean "fool or dupe."

According to this definition prat can mean "major dumbass."

According to this definition it means buttocks, hindquarters, or, as some term, "ass."

Experience shows me that, indeed, some prats are south.

I can think of half-a-dozen off the top of my head. How about you?