To puss out. To back out of a commitment out of malice, spite, or plain cowardice. To be "that guy." That means to be the one guy who goes against what everyone wants. You want Mcdonalds, he wants Burger King etc.
You: "Hey Corey, let's go to this party. There are girls there that totally want to do us."
Corey: *Pretending not to hear you* "Hey, let's go to my house."
You: "Dude, stop being that guy. You're Coreying out."
To Coreey, is to go throughout life making plans that never come to light. To create an idea that will stay an idea with no intentions of becoming reality
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)