Originally posted by straightshooter Non-conformist. Pushing society's boundaries to an almost unacceptable point by societal standards.
I think this is the closest definition so far to my understanding of the term.
It's something that makes you feel 'on edge'. Pushed almost off-balance but not quite falling over; made to feel uncomfortable; it's likely to be a a bit disturbing, but not so much that it revolts you.
So the roasting kitten wouldn't be edgy, since it's gone too far - it would just be gross.