Punnet Sphere Share definition Flag The drunken equivilant to a Punnet Square. Used in place of Punnet square as a retort to being called one initially. "You're a Punnet Square." "I'm a Punnet...circle? PUNNET SPHERE MA FUCKA!" Punnet Sphere by EvilSera February 4, 2006 0 0 Get merch Get the Punnet Sphere mug. Buy Now — $32.95 See more merch