An ideology, or system of beliefs, that prioritizes consumption and spending above all else. Most Americans practice this, while their credit lender encourage it.
Jane: Where did Stacy get those new shoes? And the purse? I thought she said her credit card was maxed out.
Jessica: Oh, it is. But she's consumptionist--you know, she believes in consumptionism...so she opened another credit card. I think that's her tenth one now.