The verb impale means to pierce an object with a sharp stick. When you're preparing shish kebabs, you impale chunks of marinated vegetables and meat on pointy metal skewers and then cook them on a grill.
Impale comes from the Medieval Latin word impalare, which means "to push onto a stake." Impale can also mean to kill by piercing with a stake or spear. Legend has it that the only way to kill a vampire is to do exactly that: impale him with a wooden stake through the heart — and then stuff his mouth with garlic and chop off his head, too, just to be sure.