Where does the compound word "get-go", as in the phrase "right from the get-go" come from? None of the dictionary definitions I've seen try to explain it, and the Etymology Dictionary doesn't even have a reference to it.
The only thing I can think of is that it's short for "GETting GOing", but that doesn't explain its use as a noun.
Best Answer
It appears to be an expression from American Black English whose earliest usage is from the middle '60s. It was widely used especially from the '80s in sport papers:
(desertnews.com)
The American Black English origin is confirmed also by the American English Idioms in the News which cites as an early usage the 1967 biography by Harlem writer Piri Thomas, "Down These Mean Streets".