Origin of Phrases - S
Slow poke
Meaning: A person who is slow
Example: I am late for dinner because I got stuck behind some slow poke on the highway.
Origin: Poke has a number of meanings, including to move or act slowly or aimlessly. For example, "we just poked around and didn't accomplish much".
So "slow poke" is almost redundant. This phrase probably evolved as originally describing the action (e.g.. moving slowly) to become a description of the person performing the action.
Also makes one think about the word cowpoke. Perhaps "slow poke" was a description of a slow cowboy.