Definition: Rocker. It's all the rage in 2010 snowboard design, and has migrated over to the ski world as well. What exactly is it? Basically, a rockered snowboard has a tip and tail that is more drastically upturned than normal, which allows the board a greater amount of float in deep snow, and also helps to lessen the chances of "catching" on a rail or box.
Examples:
The new K2 snowboards with rocker are awesome!