yippy hack Share definition Flag A vigorous sex move done down south, usually involving lots of screaming and animal noises. Traditionally done in a field or barn. "OH MAMA, Jeanette Cosby yippy hacked me so hard last night!" yippy hack by mothabrotha May 1, 2010 0 0 Get merch Get the yippy hack mug. Buy Now — $32.95 See more merch