This is "magpasarap" on steroids. It's not just treating yourself; it's feasting like a king, often with a slightly negative connotation of greed or overindulgence. Think of corrupt politicians who "nagpapasasa sa kaban ng bayan" (revel in the nation's treasury). On a lighter note, it's you at an unli-samgyupsal buffet, determined to eat more than what you paid for. You're not just eating; you're indulging to the max.