Deesk’aaz means “it is cold” in Navajo. It refers specifically to the current state of the weather. It is not used to describe cold meat, cold water, or things of that sort.
This word is great because it can stand all by itself as a sentence. “Ooh deesk’aaz!” is a fairly common saying (“ooh” approximates to “very” in this case). Just remember: just because it’s cold out before sunrise doesn’t mean you don’t have to go running (to the east)! 😀