"You canker blossom!" 3 Shakespearean Insults
1921, from goof + -y (2). The Disney character of that name began life c.1929 as Dippy Dawg.
Silly; foolish; crazy; dotty •Nearly always has an affectionate and amused connotation: a goofy grin/ a goofy awkward kid/ And he looked, well, goofy (1921+)