1) Any concept or topic of discussion occurring primarily to satiate intellectual cravings.
2) Suggestive of any concept or topic of discussion that is excessively intellectual. Oftentimes not grounded in the practicalities of everyday life.
"Yea, I still remember some Immanuel Kant philosophy from school, but I don't such material useful. It's for professors, philosophers, and sophists. Kant's book is just one of many intellectual chew toys."