Eco-On Share definition Flag Coming from the know Fact Eco has a big penis. Although not as big as Donalds, Eco is still well hung. To have a Semi-hard on. see Donald-On "I got a rush of blood, check my Eco-On laddies. soon it will be a Donald-On." Eco-On by RocketDan September 5, 2004 0 0 Get merch Get the Eco-On mug. Buy Now — $32.95 See more merch