jobbernowl
/ˈdʒɒbənəʊl/informal
noun
1A stupid or foolish person; an idiot, a numbskull.
2The head, especially that of a stupid or foolish person. Now English regional and rare.
Origin
Late 16th century; earliest use found in Thomas Nashe (d. c1601), writer. Origin uncertain; perhaps from jobard or its etymon Middle French joubard, French jobard + noll.