Slick Egg Share definition Flag A testicle that has been inserted into a wet vagina and then removed from said vagina, thus making it feel similar to a slick egg. Dude 1: Bro, I slick egged my girlfriend last night! Dude 2: Nice homie! Slick Egg by Cheetahz December 23, 2016 0 0 Get merch Get the Slick Egg mug. Buy Now — $32.95 See more merch