Preheation Share definition Flag The state in which an oven is being or has been preheated in order to cook munchies. Preheation is almost complete, then 10 to 12 minutes to cook before enjoying delicious pizza rolls. Preheation by DeMullet January 7, 2011 0 0 Get merch Get the Preheation mug. Buy Now — $32.95 See more merch