I've had that happen a lot, especially if I chug down as close to a gallon of water as I can get. Something about stretching your stomach makes it hungry as a beast later on.
It also has to do with blood-sugar levels. Naturally after you stuff they increase, and after a stuffing they go through a period of continued elevation. But eventually they decrease, and quickly. The blood-sugar crash is what makes you feel ravenous a few hours after a stuffing.