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.
Extended periods of zombie mode can also occur after a bad night's sleep and can last most of the day. Symptoms include not being able to function properly throughout the day and general malaise.
Zombie mode is comparable to a hang-over but it doesn't usually occur as a result of alcohol although zombie mode, combined with a hang-over is a potentially deadly combination.
Marshall: You eventually find your soulmate like i did when i met Lily.
Ted: If i think about it, i got better chance to meet up with Angelina Jolie rather than finding a wife for me.
Marshall: Don't be absurd.
Ted: Barney "Quit your Zombie Mode and back me up here.