slimeyballs Share definition Flag A noun, used to describe the slippery and slimey nature of a man's testicles after activities such as shaving, sweating, or ejaculating. The humidity in the rainforest gave me slimeyballs so I took a shower. slimeyballs by fluuuuu March 23, 2016 0 0 Get merch Get the slimeyballs mug. Buy Now — $32.95 See more merch