This is a Main Menu command - it should be typed when in the game's main menu (similar to 'developermodeon'), not into the developer console. Typing this into the main menu will enable Raw Meat Mode, which makes it so that when you die your save is permanently deleted (so one death ends on your game). Type rawmeatmode into the main menu again to disable this mode.
The syntax for the rawmeatmode command is as follows:
rawmeatmode
Search our database of 109 The Forest commands...
Okay!