Also a term used for a certain Snow condition.
For example:
There is a snowstorm on sunday night that drops 14" of snow
Monday stays very cold, allowing snow to stay light
Monday night brings slightly warmer temperatures, causing 2 inches of heavy sleet-like snow to fall.
Now, on tuesday, temperatures drop again, causing the wetter snow on top to become frozen over, like a crust.
Tuesday afternoon rolls around, and you find a patch of hill in the woods that is untracked. While riding down, the snow breaks into large chunks, while allowing the nose to submarine into the softer, underlying snow.
That is chunder