Pondering
philosophical questions, which may be enjoyable, yet are so removed from reality, or experience that they have no practical use.
Someone that thinks of far out 'what if' questions
Note- Not all
philosophy is mental
masterbation.
"Today we spent three hours mentally
masterbating to Kant's critique of pure reason"
"I got a degree in mental
masterbation!" someone graduating with a degree in rhetoric,
philosophy, anthropolgy, multicultural studies, etc