A fusion of newspeak and leetspeak to indicate that something is superlatively bad. Alternatively, "!1337++," "++!1337"
NOT RECOMMENDED for use in verbal conversation, as it makes the speaker sound like a complete t00l.
A tool, in daily conversation: "Arrgh! That memo about the new dress code is doubleplus unleet! No more pocket protectors!"
A l33t haxx0r, in e-mail/im: "WinME+56k+hateway=!1337++, -kthxbai (And yes, I actually ran on that through 2003)"