Necroposting

Any post or comment made on a forum thread that's very old, e.g., a thread with the last comment being several months old. This type of posting is often done by those who may have stumbled across a thread using search, without realizing no one is actively talking in the thread. Necroposting is looked down upon among the forum community because it is bad forum etiquette to reply to a discussion that already ended.

Computer slang, Forum, Internet terms, Post, Thread