Next time you have a question like this, try running a search
Anyway, a nef is someone who posts useless posts simply for the purpose of upping their post count.
A good example of a nef post would be someone posting "just passing through" or "la la la" in this thread.
That was an excellent answer, Azraele.
But now, to prevent the inevitable smart-aleck from posting "la la la,"
we are going to lock this thread down.
AnandTech Moderator