Natty Fofo Share definition Flag A United States National Forest. When crossing into any national forest it is required to yell out "Natty Fofo!" Hey Erika! We just entered Wayne Natty Fofo!! Natty Fofo by cashmoney78 June 16, 2010 0 0 Get merch Get the Natty Fofo mug. Buy Now — $32.95 See more merch