Zombied simply means it's on auto-pilot and has jumped the shark. That the writers have written to the lowest, cultural denominator which is now a zombie show. That the show is on it's last legs.
When a guy doesn't necessarily ghost you. It's in the middle of still a bit of talking, but you're not in a talking stage anymore. In good terms, but not friends.
When playing Black Ops Zombies from level 20 and up for about 2+ hours, and your head feels stressed, your hand hurts, and eyes water. Too many zombies for too much time.
a state in which your brain is too lazy to do anything useful and make sense, so you just stay put on one place and do nothing. But not yet total-zombied for you can still blank stare at people and say "uh huh?"
Andy : "hey dude, what's up?"
Cez : ... (blank stare at the floor)
Andy : "dude?"
cez : (slowly look at Andy) "uh huh?"
(staring back to the floor)
Andy : "damn man, you're half-zombied today"