A phrase used frequently by shoppers that means to embrace the moment.... to seize the deal on that tonal tracksuit... to put that exclusive sneaker drop in your cart... to enjoy the good things now and in the future.
"OMG did you hear about the deal Dave got on his new sneakers?"
"yeah - he totally Carte Diem'd!"
When someone goes to happy hour without the permission of their spouse, and masks the beer smell by grabbing and starting to drink a beer from a case hidden in the garage.