saphead - Wiktionary, the free dictionary

From Wiktionary, the free dictionary

From sap +‎ head.

• IPA^(key): /ˈsæphɛd/

saphead (plural sapheads)

1. A simpleton, a stupid person.

   • 1938, John Fante, "Wait Until Spring, Bandini", (novel), Ch.5:

     "You're dumb. A saphead. You don't savvy anything."

• simpleton, milksop

• A-shaped