noun: An unsophisticated person who comes from a rural area.
Alluding to a person with straw in his clothes or smelling of hayseed and regarded as a country bumpkin. Earliest documented use: 1577.

HAY-SPEED- in circa 1967 a one hit wonder named Mister Earl whom they often called "Speedo" was on the skids. His friends "The Drifters" wrote a question/response stage song with the refrain "Hey speed" to facilitate the re-invigoration of Speedo's fame.
The song is a wonderful hoot. I'll edit in a Youtube rendition if one exists.