An spit can refer to either saliva or a strong feeling of disgust.
When people say that something makes them want to spit, they often mean it's so gross or unpleasant that they feel physically ill. This might happen when they see something disgusting, like an old dead animal on the street, or taste something bad, like spoiled food. In this sense, spitting is a reaction to something that's just too much to handle. On the other hand, spit can also be saliva itself, like when you're eating a piece of gum and you need to get it out of your mouth with some spit.
A thin metal or wooden rod on which meat is skewered for cooking, often over a fire.
