Napanoon Share definition Flag A noun to describe a period of sleep or nap in the afternoon period of the day. Usually occurs after a Good lunch! I am feeling tired dear. I going to bed for a napanoon. See you at teatime. Napanoon by dopplebockdunkel January 23, 2010 0 0 Get merch Get the Napanoon mug. Buy Now — $32.95 See more merch