By Julie Kliegman The kids television channel now broadcasts graphics-filled NFL games. It hosts a wacky football highlights show. It even held a golf competition. Which sports will it Nickify next? On a Tuesday afternoon in November, former NFL wide receiver Nate Burleson stood patiently in a CBS studio as slime was applied to his face. A Nickelodeon crew member armed with a ketchup bottle full of the green stuff squirted tiny globs onto a rag and carefully dabbed him with it. His NFL Slimetime cohost, 13 year-old Young Dylan (né Dylan Gilmer), who also stars in the channel’s Tyler Perry vehi…