Someone whose character is marked by an absence of any quality depth while defining what little personality they possess by material or other insubstantial means.
Gary: You mean Brian Peppers?
Ace: No, dumbass. He's cool.
Gary: Oh -- you mean the dude who ALWAYS wears Polo shirts and talks about his Benz like he's the $hit?
Ace: Yeah - him. That's one shallowficial cat.
Gary: F that JBag. Let's go to Taco Bell and get a Grande meal.