On internet forums, when a thread
that has been inactive for months, sometimes even years, receives a new response and becomes active again. The term can refer to:
1) the resurrected thread itself, and/or
2) the act of posting in a thread and thereby reactivating it.
1) Wow, this thread's from 2003. We got a zombie!
2) I know this is an old thread, but I zombied it because it might be worth a read by some of the newer users.