"Betting on the Come" is derived from a gambling expression and means you don't have what you want or need, now at the moment; but, you are betting or hoping you will have what you want or need when the time come
He thought he would win the lottery but he was just betting on the come.
Homeboy betting (as defined by Shaquille O’Neal on Inside the NBA on TNT) is betting whether or not a teamwill win, without the use of a point spread system. (I.e. Betting on the warriors to win outright and not mentioning by how many points or the +6 or -6 is enough to win the bet.)
“Hey Kenny, I have a question. Warriors +6 Rockets -6, what’s all that mean; like, whatever happened to homeboy betting?” -Shaq
“That’s not how Vegas make they’re money.” Charles Barkley