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."
Corey: *Pretending not to hear you* "Hey, let's go to my house."
You: "Dude, stop being that guy. You're Coreying out."
by thesef April 10, 2009