To create a crawling zombie (crawler) in the Call of Duty games. You can find said zombies in Zombies mode in Call of Duty: World at War and Call of Duty: Black Ops. Creating a crawler is crucial to survival because they are much slower than normal zombies, allowing for people to go to buy perks or guns or try their luck with the mystery box.
Tim: Yo, should we crawlify a zombie this round?
Dom: Yeah man, I'm tryna get a Ray gun or a thunder gun. GRIZZ-MODE ACTIVATE!