Any line derived from the rapper Xzibit himself or the MTV show Pimp My Ride. Xzibitzms have been popularized by the YO DAWG internet meme
These are two examples of an xzibitizm:
EX1: YO DAWG, WE HEARD YOU LIKE MUSIC, SO WE PUT SOME MUSIC IN YOUR MUSIC AND CALLED IT A REMIX.
EX2: YO DAWG, I HERD YO AND YO DAWG LIKE YO YOS SO WE PUT YO DAWG IN A YO YO SO YO CAN YO YO YO DAWG WHILE YO DAWG YO YOS, DAWG. (google image for visual reference)