A pun by the fanbase of tokyo ghoul about the main character kaneki ken.
It means "can you not?", except from the 'kaneki' part which is usually added just for fun.

Not entirely too popular and is more known as "Ken you not?"
Person 1: "Want to go and do {insert hated action here?"
Person 2: "Uh, Kaneki Ken you not?
by Speerut May 7, 2016
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To pull a ken kaneki is when a weakling/cowardice character (usually the main protagonist) has taken so much abuse that he eventually just snaps and becomes a total badass.
That character pulled a ken kaneki and just massacred all those people with no effort!
by Clogen June 13, 2020
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