I hate it with a passion.
It's in the same boat as "/thread."
Basically saying "everyone should view MY post as the all powerful thread deciding statement. No one needs to post after me because I was right and anyone else suggesting that the answer to the thread could be something other than what I said is wrong."
As if everyone is supposed to share exactly the same view as them.
I find, no matter what the validity of someone's statement, saying "nuff said" or "/thread" will make them look like an ignorant jackass.