Big Hurtle is an Elusive Plant Foe in Plants vs. Zombies: Battle for Neighborville. He resembles a Citron wearing a green "Werble the Turtle" Hat. He can be found in Town Center and defeating him awards the player with the ELUSIVE FOE: Big Hurtle medal.
His name is a portmanteau of "Big Turtle," referencing the large stuffed turtle on his head, "hurt," and "hurtle," meaning "move or cause to move at a great speed, typically in a wildly uncontrolled manner," which might be a reference to Citron's Spin Dash ability.
As with many other Battle Zone enemies, the easiest way to defeat him is to use the Space Station and beam him up with the Crater Maker, as he won't move that frequently, allowing for a quick and easy vanquish.