Is a term used to describe someone who has consumed excess amounts of alcohol and smoked marijuana. This is because a person who has done this usually turns very pale and loses the ability to complete basic functions, such as holding a conversation or using their cellular devices. A person in zombie mode also will struggle to stay conscious and may pass out very early.
Example 1: On Halloween eve last year some of my friends drank plenty of alcohol and walked over to a seniors house, where they then smoked marijuana. After this they walked back through campus to their dorms, thus being zombies for halloween.
Example 2: Went to a party and saw a freshman I knew sitting on the couch all alone. I went over to initiate a conversation with the freshman only to discover that he could not hold a conversation or even keep his eyes open. He was in zombie mode.
Example 3: Person 1: Hey man, what happened to you last night?
Person 2: Yeah, I passed out at like nine o'clock.
Person 1: Really? Why?
Person 2: Dude, I was a total zombie last night.