yokies Share definition Flag The act of moving your testicles up and down, by way of a thrusting motion in order to get them to make a sound; usually a slapping or fapping sound. Justin was in his boxers doing yokies to his friends. yokies by jesuswasdef April 6, 2010 0 0 Get merch Get the yokies mug. Buy Now — $32.95 See more merch