Wishing you knew when the end of the world is so you could have that last piece of cheesecake. In a more general sense the desire to do anything you generally deny yourself when it won't matter any longer to be thin, or rich, or whatever because the world is going to end.
I wish I knew when the world would end because then I would have that last piece of cheesecake.
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)