"It's gonna be a slow come" relates to betting on the come, then rolling the dice for your point.
If things start looking bleak, either on that roll of the dice, or when waiting for an important business deal, you know it's gonna be a slow come.
Before we get that truck unloaded it's gonna be a slow come.
Fogey/fogy /fougi/ sl. (early 18C+, orig. Scot) old-fashioned, stuck-in-the mud.
Person with old fashioned ideas which he is unwilling to change: Come to the disco and stop being such an old fogey!
You think me an old fogeyand an old tory, his thoughtful voice said. I saw three generations since O’Connel’s time. I remember the famine. Do you know that the orange lodges agitated for repeal of the union twenty years before O’Connel did or before the prelates of your communion denounced him as a demagogue? You fenians forget some things. (James Joyce, Ulysses. Penguin Books,1992. p. 38)