Cave myself out
When you don't have to work or have any appointments or obligations and you don't want to leave your house or talk to anybody or do anything on your list of things you should do, as though you were hidden away in a cave.
Person 1: "Hey man, what are you doing tomorrow?"
Person 2: "Nothing dude, I just want to cave myself out."
Person 2: "Nothing dude, I just want to cave myself out."