A long story, but to give you a reasonable explanation: there is a group of intellectuals in many of these high profile Universities who hold this opinion that India shouldn't hold on areas like Kashmir and many of the Northeastern Indian regions. And they should be liberated. Now there motive is everybody's guess, whether they are Utopian fools who think giving everyone what they ask for, solves all the problems or they are stooges of terrorists/separatist organisation.
I personally think most of them are the former, Utopian fools who think they are Rang De Basanti's Sidharth.
They got this name because of a video surfacing during the 2015s/16s(don't remember the date) when a bunch of students of JNU(allegedly) were chanting slogans like "Bharat ke Tudke honge inshallah inshallah".
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