As defined in the world of achewood, the activity of fluffing one's hog is defined as one the act of sucking on anothers phallus. It is usually used as a threat or retort to a comment you find. It can be further emphasised by telling someone that they will soon taste your hog.
"You diss my dog, you fluff my hog"
"You are about to enter a world where the only activity that exists is tasting my hog"