I think this is what they call a loogie. (might not be spelling that correctly as I don't think I've ever written that word out, lol). A snot rocket. A snot ball. Good stuff. The greenish color is a sign of infection, virus or allergy. Meaning, it can mean nothing other than you have excess mucous. If you have a fever, that's time to get treated for infection. When I have colorful snot, it's usually on the tail end of being sick. And you absolutely can move it from your nose/sinuses to your throat and spit it out. Lovely. good luck