A person, specifically a drug addict, likely a crack head, usually found at a bus stop or the exit of a fast food location where they try to bum money off people exiting the fast food location, such as McDonalds.
One of the sketchy drug addicts is walking towards the car window.
Girl: "omg! What is that? Do u know them?"
Boy: "no, I have no idea who they are! I think their confused!"
Girl: "lock the door"
Boy: "omg its a drug zombie!"