jizzernaut Share definition Flag an individual possessing the ability to produce an overpowering or destructive amount of semen. I realized my buddy Covs was a jizzernaut when he laced his boyfriend Kevin with semen from head to toe. jizzernaut by the dragon slayaz March 2, 2009 0 0 Get merch Get the jizzernaut mug. Buy Now — $32.95 See more merch