Definition & Meaning of "saphead"in English

What is the origin of the term "saphead" and how is it used?

"Saphead" combines "sap" (a gullible person) with "head" as an intensifying suffix, forming in American slang in the late 19th or early 20th century. It refers to someone foolish or easily deceived. The word appears in casual insults or humorous criticism. It is derogatory but relatively mild.