1. Its the second hardest difficulty in Call of Duty: Modern Warfare 2.
2. When something soft has been left to harden. (In the wind, hairdrier ect.)
Guy 1: OMFG I JUST BEAT THE GAME IN HARDENED!
Guy 2: Who gives a shit I beaten it on Veteran already.
I left the pie in the window, it just now hardened, let's eat!