It means when something has finished, and is usually said when a person has won something easily, or when deep down, the person knew they were going to win.
April, May, June, and Julie were playing monopoly. April was in the lead with over $3,000, and when May, June, and Julie all declared bankrupt, April shouted, "That's all she wrote, bitchezzzzz!"
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)