slick fuck Share definition Flag The act of sliding ones penis in between another persons thighs, in the hope of reaching climax. Convict 1:"Do you want it in the ass?" Convict 2:"No, I would rather you slick fuck me." slick fuck by Franky May 6, 2003 0 0 Get merch Get the slick fuck mug. Buy Now — $32.95 See more merch