Ho-ho-hold onto your l ightsabers and phasers , folks! As we inch closer to the festive season, it's time to merge the worlds of geekdom with a sprinkle of holiday cheer. Picture Darth Vader caroling, or a Christmas tree aboard the Starship Enterprise. Whether you're a Jedi, a Trekkie, a Ghostbuster, or an Alien enthusiast, these memes are your ticket to a galaxy far, far away from the usual holiday fare. Get ready for a sleigh ride through the cosmos, with Santa hats sitting atop alien heads a…