That's mastUrbation.
I might be wrong but I think the spelling is right. It is not spelled as the other act (sexual).
Mental Masterbation
Pondering philosophical questions, which may be enjoyable, yet are so removed from reality, or experience that they have no practical use.
Mental Masterbater
Someone that thinks of far out 'what if' questions
"Today we spent three hours mentally masterbating to Kant's critique of pure reason"
Anyways, don't take me serious, am just being a goof.
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