Heyo Share definition Flag A verbal indication of exuberance, surprise, or admiration Down in the valley where I laid her down, the last time I saw her, I saw her in greyo. All in greyo All in greyo, I fucked her so hard my neighbour went Heyo! Heyo by Assbank June 13, 2005 0 0 Get merch Get the Heyo mug. Buy Now — $32.95 See more merch